Malicious PDF — malware analysis report

Static analysis result for SHA-256 922251e79ab71f5a…

MALICIOUS

PDF

80.4 KB Created: 2021-04-08 07:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 46893f63f4f32dab2a7d5d8041315c79 SHA-1: 93eb4daecbff93e6bd1e3e3d735f01af765ff99f SHA-256: 922251e79ab71f5a75dbbc4c73e4a70ffa8a303e5f412037d450de9ccc374a25
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=why+britax+car+seats+are+best PDF link annotation
    • https://cdn.sqhk.co/gokitoser/agj5Pgj/best_tumblr_video_er_for_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491669/normal_60512fab3b4c8.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutesilo/jBihShc/42412001247.pdfIn PDF document text
    • http://lemixebu.22web.org/47830317217.pdfIn PDF document text
    • http://wavesubikuviv.iblogger.org/67212497309.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456985/normal_5ffd98c6e8b5b.pdfIn PDF document text
    • https://cdn.sqhk.co/nogugojuri/eBavgfo/uefa_champions_league_results_live_score.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466173/normal_604bcc96837b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449777/normal_602a2f5c4a477.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384050/normal_5ff008b958260.pdfIn PDF document text
    • http://vukuradi.mygamesonline.org/xedimotiras.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422658/normal_606dd118bd340.pdfIn PDF document text
    • http://xenakasewexibal.sportsontheweb.net/51046451659.pdfIn PDF document text
    • https://cdn.sqhk.co/zobazulibes/KhigKjf/zofimugivekasajonedasow.pdfIn PDF document text
    • https://cdn.sqhk.co/fijufupuga/icGhdUb/30216812708.pdfIn PDF document text
    • http://nakapugevonisu.iblogger.org/74287956049.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_b99a215786464b1ea8b0520596e3f1a2.pdf?index=trueIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_0208c9a60c824ffd8f1540330e04e184.pdf?index=trueIn PDF document text
    • http://sabukizazuse.epizy.com/honda_gcv160_pressure_washer_maintenance.pdfIn PDF document text
    • http://fepoxojosatomu.epizy.com/75803213177.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_off0000fce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE9 5180 bytes
SHA-256: 0c32456ee4bda280833c6d17c33851904d2a2857f51a965937bd27ca8990b52d
font_01_sfnt_off00010e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E95 11016 bytes
SHA-256: 7b4c1c51f3df3511d9fcef23d20bfea9d180bd42ccfefe75f1be5bdedc45f3aa

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