Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8bb69a8b86f4c25…

MALICIOUS

PDF

76.9 KB Created: 2021-02-28 15:30:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 54576fc4a74423836ded580564d57930 SHA-1: c56b04db3075480e68c87b2cbc6d659d61b44e72 SHA-256: d8bb69a8b86f4c25aaa11d4cbc89ac42fdacf6c66f99d707eacade999efb8320
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file is identified as malicious by both ClamAV and an ML classifier. It functions as a link farm, containing numerous external links to other PDFs hosted on various domains, including disposable ones. The primary purpose appears to be SEO manipulation or distributing further malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The embedded URLs suggest a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/award?keyword=breville+juice+fountain+plus+recipes PDF link annotation
    • https://zeloruzo.weebly.com/uploads/1/3/5/3/135349371/bekuvebalaganu-lewiwuw.pdfIn PDF document text
    • https://tovuwofox.weebly.com/uploads/1/3/4/7/134731163/20cca31a9e9473.pdfIn PDF document text
    • https://musuvawe.weebly.com/uploads/1/3/4/5/134528527/wuwawagusetuf-gexadikuku-ruluxi-xawepevikoso.pdfIn PDF document text
    • https://bovabesizepin.weebly.com/uploads/1/3/1/3/131383515/vipofawomibopig-dekidafijomi.pdfIn PDF document text
    • http://digovin.getenjoyment.net/how_to_gain_weight_for_blood_type_b_positive.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415322/normal_601bb3fbcc041.pdfIn PDF document text
    • https://famotufenimuz.weebly.com/uploads/1/3/4/1/134132127/bazeko.pdfIn PDF document text
    • http://sipataj.sportsontheweb.net/dutemawedugogukolu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382948/normal_5fe2ba71242b9.pdfIn PDF document text
    • https://fexiganariv.weebly.com/uploads/1/3/0/7/130739648/351e8463fee09.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bugenerefajujus.atwebpages.com/kuwonudizinexowopon.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/illumina_genomestudio_sample_sheet.pdfIn PDF document text
    • http://boxijekew.atwebpages.com/how_often_do_you_get_paid_at_dollar_tree.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/bafg_bayern_formblatt_8.pdfIn 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_off0000dace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACE 5192 bytes
SHA-256: bf8cfab4e0b84231169b7846b618e1480926093f28756222c66c58ce5f34ef46
font_01_sfnt_off0000ec97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC97 10584 bytes
SHA-256: 2cc6b150119b4c213bdb77eb3b900ceb90e3354b2b3f7cb15fcbcc95831b2e0b
font_02_sfnt_off000110cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CC 16312 bytes
SHA-256: 028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b

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