Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaea78ef630914db…

MALICIOUS

PDF

78.2 KB Created: 2021-03-16 04:27:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 277c19338c742fb5a167be9fa984a720 SHA-1: 5eca6ec242d33ab0381b461d2db485e0d9659ff5 SHA-256: eaea78ef630914db1a2a51e99f1977766e57479ffda0d12c633552cbdecfb64a
186 Risk Score

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 0.9998

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://pelibifir.ru/123?utm_term=probation+review+meeting+questions+and+answers PDF link annotation
    • https://cdn.sqhk.co/gegenosuzun/Zigiaid/my_mobile_account_assistant.pdfIn PDF document text
    • https://cdn.sqhk.co/tezizejaropu/fjgigib/live_football_tv_hd_2020_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/purizepore/jh1hahd/zokekupikuwa.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/jd1Fif1/94792927909.pdfIn PDF document text
    • https://xomiwisaxi.weebly.com/uploads/1/3/3/9/133999446/bulogowimajas-wefifopexube-nigasudibese.pdfIn PDF document text
    • https://bikizulotozenap.weebly.com/uploads/1/3/1/8/131860645/ralafoxadil.pdfIn PDF document text
    • http://kozidozilujivox.getenjoyment.net/motemapokokugoborexalabak.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/ePicmic/silatoliwozunapesesemuva.pdfIn PDF document text
    • https://cdn.sqhk.co/zunesunatiri/igggfib/11383239709.pdfIn PDF document text
    • https://cdn.sqhk.co/filumabit/dijhhjg/sagiwaxasotudijizigapusis.pdfIn PDF document text
    • https://cdn.sqhk.co/berirenike/Zifbc76/walurinenarak.pdfIn PDF document text
    • http://pokezokebawi.mygamesonline.org/14933631616.pdfIn PDF document text
    • https://cdn.sqhk.co/kujufemom/dMigGYF/download_game_zombie_combat_simulator_mod.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/dungeons_and_dragons_modules_for_beginners.pdfIn PDF document text
    • https://pepakulal.weebly.com/uploads/1/3/4/8/134885681/lawigubiteva.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/deriving_the_quadratic_formula.pdfIn PDF document text
    • http://fofumumitem.medianewsonline.com/xafupamevuwe.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/aaugcji/troll_face_quest_unlucky_level_36_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D4 5532 bytes
SHA-256: 27022069ef5b2043ff9b83c75611c2f23393f9624bb3dee93131b49f987b8baa
font_01_sfnt_off00010492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10492 11004 bytes
SHA-256: 09ce156d368e33c71c1194f0309c24867c1d262cd6754390831c0e2907915df7

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