Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0057b8a1ca12499…

MALICIOUS

PDF

76.5 KB Created: 2021-03-24 16:42:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e98b5cfeaaf24a65341fbb2e4f12aead SHA-1: ae6516d915de4c2cf0bf6a0496fa92f1eecf7400 SHA-256: a0057b8a1ca12499a88add3b8534f7a1ec22a463a53934a49d25600a7b2e2ac2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant number pointing to disposable domains and identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

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://jacksth.ru/award?keyword=artemisia+afra+pdf PDF link annotation
    • https://cdn.sqhk.co/furugilenu/tt4iac8/dream_city_metropolis_mod_apk_latest_version.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462379/normal_5ff5cc70a9318.pdfIn PDF document text
    • https://tavutafaj.weebly.com/uploads/1/3/1/4/131482866/risipezilo.pdfIn PDF document text
    • https://cdn.sqhk.co/segevenujuka/bMihhab/famous_french_songs_sung_in_english.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488572/normal_5ffdcb8e8701a.pdfIn PDF document text
    • http://betifogolejom.iblogger.org/adonai_lyrics_and_chords.pdfIn PDF document text
    • https://cdn.sqhk.co/wumidimux/ieFjbOm/72142093573.pdfIn PDF document text
    • http://fowagovujag.22web.org/past_tense_worksheets_grade_4.pdfIn PDF document text
    • https://legipulevigo.weebly.com/uploads/1/3/2/6/132695741/fb4eec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422622/normal_60274b0bde4b8.pdfIn PDF document text
    • https://cdn.sqhk.co/werutojij/cjdigCb/pba_card_2020.pdfIn PDF document text
    • https://pisubamu.weebly.com/uploads/1/3/0/7/130740412/623711.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vatapusaf.rf.gd/email_google_form_responses.pdfIn PDF document text
    • http://xilibosukotijob.epizy.com/pomebinutedav.pdfIn PDF document text
    • http://juvemekexiki.rf.gd/68997864511.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0719f65-9c06-4282-9db0-155b11c62227/70591280491.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32f9f967-e802-49f8-8b54-b9a3f4fbd206/are_arbys_wraps_healthy.pdfIn PDF document text
    • http://vulofuza.epizy.com/mirovinojikozuva.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_off0000ea64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA64 5144 bytes
SHA-256: 55cfa1be5c6ff0a403c1cf4e9942f387dc9096b739580e2bd7388efac2b0cf63
font_01_sfnt_off0000fbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCC 12584 bytes
SHA-256: b6a89ce708e380cdd99d11b36bd346fc855052c0265a2a619a1f5d0de3c69d7f

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