Malicious PDF — malware analysis report

Static analysis result for SHA-256 126d6c252860c174…

MALICIOUS

PDF

76.9 KB Created: 2021-04-23 20:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9039d75f0dc82a50d8f1e1120a4904c1 SHA-1: 641f10c87cb6fb8f3abd15b1292abeba9cd57e32 SHA-256: 126d6c252860c1747ea731f47529f7b1df3ea05dd21583e872faabdea78c2e9c
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including ClamAV and an ML classifier. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the overall structure indicate an attempt to direct users to potentially harmful external content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=reliability+engineering+degree
    • https://cdn-cms.f-static.net/uploads/4501212/normal_603ef365688a4.pdf
    • https://static.s123-cdn-static.com/uploads/4424027/normal_5fe3d6660e17e.pdf
    • https://tibanevugite.weebly.com/uploads/1/3/4/6/134655495/356dd9d4b.pdf
    • http://alexandreablog.com/english_daily_use_word_listr2bgo.pdf
    • http://gooddevice-online.com/gerogudunesinokw0q6h.pdf
    • https://fokifukamanur.weebly.com/uploads/1/3/0/8/130874497/8500304.pdf
    • http://betmoy54.com/tuercas_y_tornillos_elster017rh.pdf
    • http://fruits-summer.fun/financiere_de_l_odet_annual_report_2017xlksx.pdf
    • https://cdn-cms.f-static.net/uploads/4407795/normal_6013f17c58446.pdf
    • http://tihefers.online/6119057687941tmt.pdf
    • http://prizinsta365.website/913340193357j8vr.pdf
    • http://basiditdcf.space/notisidekigiwines1k8h9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2ee977ac-0a40-441c-991c-2bce3ffefb9f/37052632840.pdf
    • https://uploads.strikinglycdn.com/files/44d73209-558f-4e63-90bd-6def7e0d8178/54439959942.pdf
    • https://uploads.strikinglycdn.com/files/98a10073-5ece-40c4-95ae-5dc6ddac5914/air_force_one_shadow_pastel_nike.pdf
    • https://uploads.strikinglycdn.com/files/cc1bb75d-68e5-45e4-8fc5-b114a8ccc9a9/motorola_ht1250_ear_microphone.pdf
    • http://xegubidutanaza.epizy.com/1416783524.pdf
    • http://witopovuketoj.epizy.com/ozeri_weight_scale_batteries.pdf
    • https://uploads.strikinglycdn.com/files/475e74a0-c6e4-4b38-9982-d70d6e7529fb/nopesozegepajalisorifiraf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f07b.bin
c4240ddb353ff7e5ba79a035095084c673b6d6286e3857d79250c7ff9a039414		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF07B 5064 bytes
font_01_sfnt_off000101d1.bin
91d24792c67302f05be8de6fdb3dcc1081dd6883724cffed41837bc27c124622		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101D1 10776 bytes

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