Malicious PDF — malware analysis report

Static analysis result for SHA-256 834087b553b58708…

MALICIOUS

PDF

92.9 KB Created: 2021-03-23 12:42:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8daafaca64a8418fcf9127955a2ad6e5 SHA-1: 7465c387487741bc8c6705f4890590a179e59263 SHA-256: 834087b553b587087406691f9bf2965a74bf6d95072dda3f069d7435f8d48f59
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many pointing to disposable hosting, and at least one URL redirects to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=tony+hawk+pro+skater+3+android+apk In PDF document text
    • https://cdn.sqhk.co/jekuzedu/b0GlggB/dunkirk_observer_subscription.pdfIn PDF document text
    • https://namoxatiki.weebly.com/uploads/1/3/4/4/134477177/vepidoma-gafuzega.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379377/normal_60468eee45fb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393345/normal_5ffc65c0b47ec.pdfIn PDF document text
    • https://pizizidoto.weebly.com/uploads/1/3/0/8/130873839/3588039.pdfIn PDF document text
    • https://wuwosafojopog.weebly.com/uploads/1/3/1/4/131407683/wikadop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366660/normal_604139e0cca35.pdfIn PDF document text
    • https://fusonunobowur.weebly.com/uploads/1/3/0/8/130813531/jakop.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/HjhAehf/70270783660.pdfIn PDF document text
    • https://cdn.sqhk.co/xajamenujo/627ggQG/586677983.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493917/normal_60072797a8b8c.pdfIn PDF document text
    • https://baluwakenina.weebly.com/uploads/1/3/1/4/131437578/7093187.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487208/normal_604a4af74473a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/36664bdd-adfb-41a2-99c0-20cd09e93f6b/lean_ux_audiobook.pdfIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_d56e773f82c642cc807bf12b80285f0d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/266c0cc1-379e-40f7-ba20-fdf60b9917f0/air_hogs_helix_x4_stunt.pdfIn PDF document text
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_17d03c7b13004fe19d0a6ff4f8705c32.pdf?index=trueIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_39191d13753a4bfb815176dbaa92371e.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_off00013044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13044 5388 bytes
SHA-256: 7199c473cebd2cae5edfa1569330a05822305b02031ec09ca43e7b387b007eb7
font_01_sfnt_off000142a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A7 10520 bytes
SHA-256: 5730373011bb904e514f86ddda2cb8f9540ebddbd50d2646827d53d77687737e