Malicious PDF — malware analysis report

Static analysis result for SHA-256 731923b109ab8bbe…

MALICIOUS

PDF

70.9 KB Created: 2021-03-29 10:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 60bf42e7013de98f7ba82c2ea3b0cfbd SHA-1: c7a6613e4d46b0c8e762c0028e68fafd4baf384c SHA-256: 731923b109ab8bbec68daa90eb34c777cabefcf561c659ad0097a1dbb83329e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://soxebez.ru/strik?utm_term=how+to+do+coconut+oil+treatment PDF link annotation
    • http://lenudes.com/true_metrix_pro_meter_test_stripsa1mnq.pdfIn PDF document text
    • http://mosdendy.store/pudisikobofiw9xu79.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/ibBhgil/bodiluvorusunogozokuwixi.pdfIn PDF document text
    • http://mon-fortuneo.best/nupejrcqpc.pdfIn PDF document text
    • http://opsnatur.fun/educators_guide_to_effective_classroom_managemento1jx1.pdfIn PDF document text
    • https://cdn.sqhk.co/bodujemep/vFjcijy/tidibogexopajexidevarofu.pdfIn PDF document text
    • http://raisinsapp.club/lovebajofajor7xll8.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/jizikuremebudekiw4kw6.pdfIn PDF document text
    • https://cdn.sqhk.co/xubameridiso/VjgxQSo/github_ssh_guide.pdfIn PDF document text
    • http://lalashoppen.online/lg_inverter_direct_drive_front_loader_washing_machinekgz9y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fekovip.rf.gd/time_series_analysis_in_research_methodology.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/40657343272.pdfIn PDF document text
    • http://werewipabelud.rf.gd/laporan_pendahuluan_blighted_ovum.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/59511978336.pdfIn PDF document text
    • https://4fbc56e1-d9a2-4996-be1d-38f9cd263936.filesusr.com/ugd/b1afee_8217613088f0431e95327a13cc50ba05.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/fotanalebu.pdfIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_12ecb9b694ed4b1a9ec29e3edc187b28.pdf?index=trueIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_10d170814ffe44f1ab61a4f5619c354f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/sivukedowabemuwudutudo.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_off0000da9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9A 4960 bytes
SHA-256: ccbdb1e04a28f93af68a84668b564a3e75fca6343137652838e2596744910703
font_01_sfnt_off0000eb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6F 10212 bytes
SHA-256: 25b7ce53166346c6af25f7fe8eabb50b399d2efccf72dc7179d5e8da71424dc2

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