Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac1af25153f7225…

MALICIOUS

PDF

65.5 KB Created: 2021-02-28 03:41:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4879f94fc264a483016394e4e552d860 SHA-1: 498ead20e519d12c355a73dcb882161263e0ac0c SHA-256: 8ac1af25153f72258dfd338482b5768476658e73b0951e1df82079a940ec002d
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, many of which point to suspicious or disposable domains, and one heuristic specifically flagged an invisible link designed to lure users to a malicious PDF. The document body, though heavily obfuscated, suggests a lure related to an 'answer key', which is a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://gimoguvi.ru/wix?keyword=module+2+answer+key+grade+8 PDF link annotation
    • http://getliterate.online/nadesepapefilizins6kor.pdfIn PDF document text
    • http://moshon.space/problemas_ley_de_ohm_resueltosg49a1.pdfIn PDF document text
    • http://mitatizizuje.mypressonline.com/pathfinder_kingmaker_portraits_nsfw.pdfIn PDF document text
    • http://lidzadva.xyz/qual_o_melhor_horrio_para_se_tomar_solrky3m.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/beko_hbs_7600w.pdfIn PDF document text
    • http://limecash.xyz/fish_dichotomous_key_lab_answersq2apd.pdfIn PDF document text
    • http://kinokaiff.space/powerplay_pro_8_manualcisrz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428062/normal_5fe728817e9c7.pdfIn PDF document text
    • http://mosdendy.store/402190808241rsoz.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/OShehcD/pagejorexiwulusu.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/16986010304.pdfIn PDF document text
    • http://com-login8.xyz/jarawipudelivul4g3hb.pdfIn PDF document text
    • http://desajegurake.scienceontheweb.net/95736502592.pdfIn PDF document text
    • http://golixudib.mypressonline.com/wufufulafojolixutafebi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503309/normal_5feff43c1aca0.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/valiant_mobile_password_resettbmf0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A4 5580 bytes
SHA-256: 5c0457ab840cfdf721608c31c2e6d317649f4db4c3a30958ea9303e75a5f4cf9
font_01_sfnt_off0000d7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D2 9992 bytes
SHA-256: 65861d8cd34074724aadf9497fdf686fd3974f87ef0401ea7424be5af747f1f9

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