Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d08dc20b0ec68b3…

MALICIOUS

PDF

79.6 KB Created: 2021-04-08 07:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d50244928d78aec9ccd8818cedf3032b SHA-1: dafc1077951b2d7a65df96cf3359cef8fdbe79ee SHA-256: 9d08dc20b0ec68b376a3442e5727ac0ae2e7dd388f3938295f2dda1ddd1348d0
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/wix?keyword=african+nightcrawlers+temperature PDF link annotation
    • https://wofofubuw.weebly.com/uploads/1/3/2/7/132710679/vevudewoduzepalewux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375356/normal_602b952f92934.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385880/normal_60232dbc30bee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489969/normal_606091a99a959.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/fusebofezesijunori.pdfIn PDF document text
    • http://grenkasalo4.xyz/151488142988k2yb.pdfIn PDF document text
    • https://bikugepoxo.weebly.com/uploads/1/3/5/3/135351236/32613e7f669f763.pdfIn PDF document text
    • https://tugufotekaluxaz.weebly.com/uploads/1/3/4/8/134883762/lizivamezaxe-patotalow-nejuzaweleri-gakekajibufejij.pdfIn PDF document text
    • https://wunebometa.weebly.com/uploads/1/3/5/3/135314425/3a092.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470232/normal_60201a33f1593.pdfIn PDF document text
    • http://dapovevi.mywebcommunity.org/siete_canciones_populares_espaolas_manuel_de_falla.pdfIn PDF document text
    • http://asta-stroy.ru/67301804230d32ok.pdfIn PDF document text
    • http://gakawisogafuga.mygamesonline.org/51350497714.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_6df08621ac4441a2be060accfa0c5241.pdf?index=trueIn PDF document text
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_03aab9c8014d4c62abfa84358ebc14e8.pdf?index=trueIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_0343cb3dc625459391d328d6a23794d8.pdf?index=trueIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_e2210bd156b746a39dd6b6ba10789212.pdf?index=trueIn PDF document text
    • https://aa84fbb7-d3ea-4675-94d1-3a2d808898f4.filesusr.com/ugd/661a84_9c9262713ab14c4688216a7bc9f2cdf5.pdf?index=trueIn PDF document text
    • https://c96d0889-97fb-4213-90a4-a08ae01970e6.filesusr.com/ugd/ed32f2_aa2a0194880a4ec8bca075ee584a6396.pdf?index=trueIn PDF document text
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_bd3b6ee9b97945efa9c975c42e67eba2.pdf?index=trueIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_8f80a2fa167c4ba9bd975ca4a43d0e81.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA20 5508 bytes
SHA-256: 966dcdba38131728ceadcf435b8ad06451dac2c059f4550f3a67827ba888a4c2
font_01_sfnt_off00010cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD1 10460 bytes
SHA-256: 754c0bcd99b2dc908b6f68076c7458f64eea1aeaedf03cb2f877a0d699f9a416