Malicious PDF — malware analysis report

Static analysis result for SHA-256 a940c2aba3d81215…

MALICIOUS

PDF

70.5 KB Created: 2021-03-26 09:21:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 288d48494ca8818d56f692519f60a0d9 SHA-1: cf0e109e58cbb2ccd61b4dee1ff5e53bd25ea1f6 SHA-256: a940c2aba3d812153f8884164dc8f988b76d3d1635b0673727a845fb2e07235f
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external URLs pointing to various domains. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing or trojan. The document body is heavily obfuscated, but the presence of numerous external links suggests an attempt to redirect users to potentially malicious sites, possibly for phishing or SEO spam.

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
  • 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://nipisod.ru/strik?utm_term=circle+graph+worksheet+grade+7 PDF link annotation
    • https://cdn.sqhk.co/podizapexiv/igghdMA/change_eye_color_permanently_laser.pdfIn PDF document text
    • https://rutuwupu.weebly.com/uploads/1/3/1/3/131378820/5074823.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/fihljeN/98439490071.pdfIn PDF document text
    • http://lanizimugigil.getenjoyment.net/bsnl_prepaid_plans_up_west.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/95643272442.pdfIn PDF document text
    • https://cdn.sqhk.co/wirumedaba/C2igGij/machine_gun_kelly_net_worth_2019.pdfIn PDF document text
    • http://smartcreditus.info/didutotuphl8qk.pdfIn PDF document text
    • https://cdn.sqhk.co/dugubupa/Gmpijgj/liquidations_plus_amazon.pdfIn PDF document text
    • https://daxekofaji.weebly.com/uploads/1/3/1/6/131606395/pepuzibosejifef-tugudoditow-fowef-mebun.pdfIn PDF document text
    • http://instasurprise.online/campbell_biology_test_bank58hg9.pdfIn PDF document text
    • http://kukushpa.fun/79324717160l1n6f.pdfIn PDF document text
    • https://cdn.sqhk.co/kagitenoru/gdhdhdW/50381166662.pdfIn PDF document text
    • https://cdn.sqhk.co/vopunokapire/cphioYh/amazon_prime_video_subscription_cost_in_pakistan.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/a3bc17a0-3b06-4ebf-a32c-a976466c18af/dungeons_of_dredmor_difficulty_differences.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16c42d19-5cdc-4cb2-8a61-67564ed10cec/the_wait_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/082d5f79-2865-44b6-a9ef-bfd82b0ec20c/tbs_powercube_2_in_1_fpvision.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ca1b150-463c-4364-a57d-c330fc90c01c/best_graham_hancock_podcast.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_off0000d5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D7 5476 bytes
SHA-256: b4854b224b0bb017b994eeee30549c659b4671e57f31178192a0e9327775dbe5
font_01_sfnt_off0000e889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE889 10776 bytes
SHA-256: 203d129a66ac824eb7ee644573b2a3b91bdd96a8c5d6bc6746eede8738d46d7e

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