Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e5a8666979541fb…

MALICIOUS

PDF

88.1 KB Created: 2021-05-07 13:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: db26da2c979ac24c7b1b606489236301 SHA-1: f5b07e80716b3d1388beba64e2bd4fca8a48754b SHA-256: 3e5a8666979541fb9622e05c46ebdd17c3ca68f4652fc3c690ca6813804ec203
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://nipisod.ru/strik?utm_term=what+is+a+onyx+shower PDF link annotation
    • http://vatamulejuvovi.22web.org/great_powerpoint_design_templates.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367911/normal_60518e1825fa2.pdfIn PDF document text
    • http://zekojotewakugag.mypressonline.com/getemosa.pdfIn PDF document text
    • http://telitogivel.iblogger.org/algebra_test_grade_7.pdfIn PDF document text
    • http://tibudirowe.mygamesonline.org/valadenasogumobede.pdfIn PDF document text
    • http://sarupunojupud.sportsontheweb.net/llanura_aluvial_definicion.pdfIn PDF document text
    • http://nupewijanetari.medianewsonline.com/bupigow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417807/normal_604b3303c3131.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407331/normal_5ff1bc6a9c704.pdfIn PDF document text
    • http://vitofemegawe.getenjoyment.net/ata_carnet_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463807/normal_5fd642fedd43a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391634/normal_5ff6830c5dd9d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_e0c441fd919d41ba9f4309e96fe848ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e745a667-d751-402b-9076-43fe2d42f4d7/wasume.pdfIn PDF document text
    • https://d650f791-4ca6-4964-96f1-ba9fac0414c1.filesusr.com/ugd/adf9cb_7a4492e9c5fe41d8a2cd455c2dd5b276.pdf?index=trueIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_d63a82ce238e4682a43dc326b3cfe6ba.pdf?index=trueIn PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_57c689d1772f485fadf07a6f8b830b36.pdf?index=trueIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_ffa195598d9040e3a6602cf24d886214.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisiku/how_often_replace_sodastream.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fb926e3-0469-49ba-84b9-65ba4c79f4fa/hp_laserjet_p4015n_replace_maintenance_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/american_psychological_association_guidelines.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11879 5016 bytes
SHA-256: ecf0230820e053cba2bea976c90ce32054a975db904322e71876e39b59dba564
font_01_sfnt_off000129a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A2 12428 bytes
SHA-256: b7538a306f0aa0cf8001ba9161739e572c152e213ace2e8b0156e46b9e3db082

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