Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dde902a8d7b20cb…

MALICIOUS

PDF

79.7 KB Created: 2021-04-06 15:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cf995dcb28977be5fc13ce21cd36c338 SHA-1: c9a9e0c57e2bb8b67eaaef1409531c09c598ced6 SHA-256: 6dde902a8d7b20cbaac749dfbbab3155f0b3c2929e0d19584fbfd61164bf812d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/wix?keyword=predicate+nominative+pronoun+examples PDF link annotation
    • https://cdn.sqhk.co/reriwoduriju/wPjfjas/regonakegiwozusof.pdfIn PDF document text
    • https://jepunitapo.weebly.com/uploads/1/3/1/0/131070437/019ac4f52b.pdfIn PDF document text
    • https://cdn.sqhk.co/gabadifofibo/gcigedN/baruwujuriwagovudotupetix.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/Ly4Lgem/98189197210.pdfIn PDF document text
    • https://kurepisafigovu.weebly.com/uploads/1/3/1/3/131398088/7719629.pdfIn PDF document text
    • https://cdn.sqhk.co/wegodimumod/RjcoHFQ/limabibat.pdfIn PDF document text
    • https://fizijoju.weebly.com/uploads/1/3/0/8/130814030/wexepefad.pdfIn PDF document text
    • http://mists.space/anaconda_english_filmcr442.pdfIn PDF document text
    • https://wamukefak.weebly.com/uploads/1/3/5/3/135324497/4769165.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/geErTgd/left_car_running_while_pumping_gas.pdfIn PDF document text
    • https://zobegutibeg.weebly.com/uploads/1/3/4/9/134902349/4196918.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/iggidjf/sirigegovixisutofepukozu.pdfIn PDF document text
    • http://keepqifi.space/can_i_get_adobe_acrobat_freea62wz.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/Zk1fji4/list_of_2020_pop_music_songs.pdfIn PDF document text
    • http://kadabafomelu.66ghz.com/47566608305.pdfIn PDF document text
    • http://opticsystem.website/fodakojirey2ptm.pdfIn PDF document text
    • https://cdn.sqhk.co/zixedagiro/dRjKhfP/world_cup_schedule_2019_soccer_live.pdfIn PDF document text
    • http://ogranicbio.fun/61643831601zwst7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tobaziw/mackerel_run_subtitle_indonesia.pdfIn PDF document text
    • http://mesodixole.rf.gd/cobra_xrs_9370_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/bdfoundry_ninja_guide.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_off0000f843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF843 5348 bytes
SHA-256: 378f9e171199f64a9648654126b418555d539e5e76b0b7bb5cf51754b3b53c61
font_01_sfnt_off00010a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A67 11072 bytes
SHA-256: 1a0940f1a221d8b511f7db5e87aba2f27ad65583a8c10865855cb0a6c5205dfb

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