Malicious PDF — malware analysis report

Static analysis result for SHA-256 8220bf80d33ad92e…

MALICIOUS

PDF

84.7 KB Created: 2021-02-17 18:46:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8a4b57d95ec404e845952abda711b916 SHA-1: ed5af34fc4eea4a27ed319d47ac047b44a03467d SHA-256: 8220bf80d33ad92e0bfa7a9df410d64acd461f3774cf1fe20dc04cd3a9f61406
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many pointing to disposable domains, suggesting a link farm or SEO manipulation scheme. The presence of embedded URLs and the ML_NYX_PDF_MALICIOUS heuristic strongly suggest the document is designed to redirect users to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://bologen.ru/wix?keyword=whiskey+words+and+a+shovel+epub+free+download PDF link annotation
    • http://khareedforosh.com/free_loan_agreement_template_ukh5var.pdfIn PDF document text
    • http://potenciy.xyz/45647669643ayxbs.pdfIn PDF document text
    • http://idealica-itufficiale.website/51257240712zcnmz.pdfIn PDF document text
    • http://iwhite.space/online_android_virus_scan10jmc.pdfIn PDF document text
    • http://closemaze.com/zejozunojixejewisopuru5b3rm.pdfIn PDF document text
    • http://henrysavbr.site/689666103dbdbn.pdfIn PDF document text
    • http://healthytrands.com/a_magia_sagrada_de_abramelinz15b9.pdfIn PDF document text
    • http://interbank.link/barbie_girl_dance1ba93.pdfIn PDF document text
    • http://adanakebap.org/486744185683457a.pdfIn PDF document text
    • http://tonivatibiri.22web.org/vunetuwotapunok.pdfIn PDF document text
    • https://zakupiza.weebly.com/uploads/1/3/5/9/135960967/998850.pdfIn PDF document text
    • https://vosaxivuminol.weebly.com/uploads/1/3/4/3/134387598/be6c8.pdfIn PDF document text
    • http://vagoneviwesum.66ghz.com/badoo_sign_up.pdfIn PDF document text
    • http://exemplpusj.com/18249547768zvair.pdfIn PDF document text
    • https://nopiviwefimak.weebly.com/uploads/1/3/4/7/134708781/8810569.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vumavoralamo.rf.gd/67496914427.pdfIn PDF document text
    • http://tipakixulo.rf.gd/aambala_movie_songs_masstamilan.pdfIn PDF document text
    • http://ramasewo.epizy.com/cambridge_checkpoint_science_revision_notes.pdfIn PDF document text
    • http://zujejuxuj.rf.gd/98563897560.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_off00010c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5E 5600 bytes
SHA-256: 3869aae9bc1be174145c0adf85f4406c91e787df35bed863daf2cfdeafc67f36
font_01_sfnt_off00011f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F82 11180 bytes
SHA-256: 2ea48d31c21f385ea33a16e92ca9b1805a1bdb06b70a4d64ddf134291cd8fa4d

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