Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5240261f7571c86…

MALICIOUS

PDF

89.8 KB Created: 2021-04-01 16:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 07bc94fd3716a584d62664ce5130884b SHA-1: b98c2baf9418f2b459755b149af06a1c4c673949 SHA-256: d5240261f7571c868f0e96db4a5d7f1a927031450271252664f5b05d588f2d99
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal it functions as a link farm, directing users to numerous external URLs, some of which are on disposable domains. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URIs suggest it is designed to redirect users, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bologen.ru/strik?utm_term=walt+whitman+high+school+guidance+counselors PDF link annotation
    • http://galosidijixiwu.mypressonline.com/cemento_armato.pdfIn PDF document text
    • https://cdn.sqhk.co/tokarikadez/iqUifdT/fibudazoxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496402/normal_5fde20620933c.pdfIn PDF document text
    • https://cdn.sqhk.co/luvunugoz/MGNhcX8/digital_marketing_degree.pdfIn PDF document text
    • https://funebaxap.weebly.com/uploads/1/3/4/3/134399245/7292150.pdfIn PDF document text
    • http://jotusimemirido.sportsontheweb.net/historias_cortas_en_ingles_y_espaol.pdfIn PDF document text
    • https://bevarari.weebly.com/uploads/1/3/0/7/130740456/xemifutimimevaxe.pdfIn PDF document text
    • https://xisofufewazexi.weebly.com/uploads/1/3/0/7/130776718/repud-masin-bupovu.pdfIn PDF document text
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/ramamuzurujij.pdfIn PDF document text
    • http://lilozekakotelup.sportsontheweb.net/53853176362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388842/normal_605df2dc20214.pdfIn PDF document text
    • https://mavujaxubuxabo.weebly.com/uploads/1/3/0/7/130775304/mogagofa_jatefemejawig.pdfIn PDF document text
    • http://gumidaz.medianewsonline.com/what_is_portia_de_rossi_worth.pdfIn PDF document text
    • https://cdn.sqhk.co/sixerusesebu/zibibjg/93906822225.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3eeb541e-75be-486c-a732-b1e279b2a932.filesusr.com/ugd/eaab1c_9fcf2c99e1ec4f7095607403b5b92db0.pdf?index=trueIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_ff4a33dbdf70445e9069a586baacc1a3.pdf?index=trueIn PDF document text
    • https://6f29901e-f5c9-4775-879c-97b2de5c8d5b.filesusr.com/ugd/0bf195_a9db34c5ce344129813d35ba301abf3e.pdf?index=trueIn PDF document text
    • https://755d026c-fd58-4633-9ca9-8af24261f473.filesusr.com/ugd/4622eb_3f63bf92c5434522b8124cf2f8de0acb.pdf?index=trueIn PDF document text
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_bf5305de523b4a1ab08a70368319fae7.pdf?index=trueIn PDF document text
    • https://aa0e52d0-3c12-4d86-bfd3-e3284f950a51.filesusr.com/ugd/eb1974_4ad91aa967fd4d0bab3356dfe9391015.pdf?index=trueIn PDF document text
    • https://6438efa2-cbc3-4905-bec7-85cdafd94a34.filesusr.com/ugd/d1cf8b_3a745bc21abc4baba88770d54417bf9c.pdf?index=trueIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_269c07f2b2e8459e9bfd8a4ff10c3d1c.pdf?index=trueIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_455d924cfe7f484bb57e73e782ca921c.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00A 3372 bytes
SHA-256: cf70a84b90b001be0da6cc6e9f1a5092e2c6d0eda8aa0450ecd3abefd56d4de5
font_01_sfnt_off0000fc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0B 5460 bytes
SHA-256: 8a0684e71e50e7e7fbd726d6ba6b5fee4a7e85c4dc8b2cfba5992f19f8073bb1
font_02_sfnt_off00010e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7E 3220 bytes
SHA-256: ff437c547c59d4a3af772b75c6d97ff6f3da13509b777572caccc8df48c95542
font_03_sfnt_off00011bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC4 11584 bytes
SHA-256: c255876aee0835a9cf2f5d603ee206ce25d025c7349540c5027f68e921c32d0b
font_04_sfnt_off000143aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143AA 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb

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