Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a2fe09f575f59d…

MALICIOUS

PDF

83.7 KB Created: 2021-03-17 14:37:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dcc159803b3b8ed80ff16e48a7aa10c5 SHA-1: cc43a0c6793cbacba8164a893c76fe87ff9fd28d SHA-256: 73a2fe09f575f59da0e6ee674ddbfe00b9e227d91584fede9073460611b5166d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to redirect users to malicious sites, likely for initial access via phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/wix?keyword=how+to+auto+assign+roles+in+discord+yagpdb PDF link annotation
    • http://aycotoro8.xyz/vagubuzasevipupqasj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483610/normal_5fd3b1efe721b.pdfIn PDF document text
    • https://zixavuxo.weebly.com/uploads/1/3/1/3/131398386/c68d8e4b9fab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485698/normal_601d5ef10af50.pdfIn PDF document text
    • http://zisetevopazotaw.iblogger.org/rowenta_iron_repair_san_diego.pdfIn PDF document text
    • https://wawodupalise.weebly.com/uploads/1/3/4/6/134621762/148896.pdfIn PDF document text
    • http://carinsusa.com/sodastream_black_friday_deals_canadas8enz.pdfIn PDF document text
    • http://shlifovka-pol.website/jemufok72z51.pdfIn PDF document text
    • http://wajuxerisowo.iblogger.org/26613892936.pdfIn PDF document text
    • http://wediwutesifetuw.iblogger.org/nesiladomonutonu.pdfIn PDF document text
    • https://bodupakodekafas.weebly.com/uploads/1/3/2/6/132680796/badebefonawezenaruda.pdfIn PDF document text
    • https://rusizatigaj.weebly.com/uploads/1/3/4/0/134041601/2137439.pdfIn PDF document text
    • http://remontlegko.info/zebosoxusalezevugab08bcy.pdfIn PDF document text
    • https://widijozitumude.weebly.com/uploads/1/3/4/6/134688085/xegexosojotiw-wikavafazujire.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dobejul.epizy.com/ultimate_ninja_blazing_mod_apk_2019.pdfIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_9a9c6e31ad65433f919fc6b3ec543ad5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3b86195-b41c-436d-834d-9ebf4699a6a3/bofufax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/499e0bae-5bcd-4097-ad90-bff23926c4dd/gejowavaretoge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eca81bb-d781-4075-b001-e7b9ee16ed48/damimoxorafobejove.pdfIn PDF document text
    • https://6674166f-eb58-46b1-9d38-a528bc95e02c.filesusr.com/ugd/e38d8e_5f22e96f1e334e7a8e51d40a5203b6ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9c8bb7e-3a18-4141-b1de-08f2e3f96d8b/57365946293.pdfIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_57837812fbe043fe9b5a4b44cdb73f66.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 5536 bytes
SHA-256: e2849cf4e48268ebe20824c15e43aec4e60afd9754d19b0d4898f07542dfea82
font_01_sfnt_off000104a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A1 11368 bytes
SHA-256: 2613b4194260799caa4bc00864037c4d1ca20034970b02c21b1e026d8204f939
font_02_sfnt_off00012ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA0 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15