Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1dc8d2563d1fa3…

MALICIOUS

PDF

172.1 KB Created: 2021-03-14 23:21:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce44f0a870f40b1970f8eea98a2ed1ea SHA-1: 53a55615a0a66558884a68b3e0a83522b0603963 SHA-256: 7f1dc8d2563d1fa392f9312411ee648308dfecfff8b7f15fbe910a7f39d471ef
134 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The heuristic 'SE_URGENCY_LURE' indicates the document likely uses time-sensitive language to prompt user interaction. Although no scripts were extracted, the presence of numerous external links and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ponafet.ru/strik?utm_term=les+miserables+musical+album
    • https://cdn-cms.f-static.net/uploads/4486051/normal_60188b333ee2f.pdf
    • https://gedobelega.weebly.com/uploads/1/3/4/3/134375191/c8c1359407.pdf
    • https://fobabunopana.weebly.com/uploads/1/3/0/9/130969757/09d90220727f64.pdf
    • https://cdn-cms.f-static.net/uploads/4389361/normal_5fd3b56555d7e.pdf
    • https://static.s123-cdn-static.com/uploads/4502268/normal_5fe20b08d3805.pdf
    • https://pexififowuru.weebly.com/uploads/1/3/4/7/134714045/reliwosum_nogejojaxuzobi.pdf
    • http://mopexaxurip.getenjoyment.net/adobe_premiere_pro_cc_2020_shortcuts.pdf
    • https://cdn-cms.f-static.net/uploads/4377408/normal_5fdc58de79d52.pdf
    • http://pivolirarorip.mypressonline.com/gate_aptitude_questions_and_answers_free_download.pdf
    • http://nipizakevenuvis.scienceontheweb.net/59439909319.pdf
    • http://roxelejabojafe.scienceontheweb.net/34023476150.pdf
    • https://xolovimuwoza.weebly.com/uploads/1/3/4/8/134865524/mafela.pdf
    • https://buzomuzugagi.weebly.com/uploads/1/3/4/3/134313884/1a078603.pdf
    • http://lojapidabud.mypressonline.com/mountain_america_credit_union_promo_code.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jiwisigetizoxif/czardas_sheet_music_clarinet.pdf
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_c510269e293947c19e745390dd25ffac.pdf?index=true
    • https://4868a29a-6d77-448d-a9c5-bc5c6a1713c3.filesusr.com/ugd/060e50_80660691935241bba33caccd9bf8eb64.pdf?index=true
    • http://zuputes.atwebpages.com/72260020041.pdf
    • http://pikubub.onlinewebshop.net/aircraft_maintenance_technician_jobs_canada.pdf
    • https://s3.amazonaws.com/kodipopujufipig/medical_alert_systems_consumer_reports.pdf
    • http://jemileti.atwebpages.com/porsche_993_buyers_guide.pdf
    • https://s3.amazonaws.com/wezukep/scert_kerala_textbooks_9th_standard.pdf
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_55710868280c4cb5b180177a8131243e.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024bda.bin
1e78d8fd3404d8829a6761a8958fbfcbfc5e0d51b803a167923d083397b75aed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x24BDA 5024 bytes
font_01_sfnt_off00025cd8.bin
aa80890658bbd3dc892253fc46b3222861f551b7674981c9010fa863ae5b36ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x25CD8 14828 bytes
font_02_sfnt_off00028ac1.bin
74b3928b874042211253f184eb26f9a349cd733672d7a60eaef9485bb5ae803f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x28AC1 16292 bytes

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