Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e17278931c34f44…

MALICIOUS

PDF

68.3 KB Created: 2021-02-23 14:29:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4e1aa464dc0bd071fec0ef6982529276 SHA-1: d91a903cb177fbe210025343e769a60b65bf62da SHA-256: 8e17278931c34f4468ed2a750859798f238c9ac325db0bcc9f46a48226b62517
126 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 malicious redirect to 'maypoin.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, further suggesting malicious intent. The ML classifier and ClamAV detection strongly support this PDF being malicious, likely used as a phishing lure or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/strik?utm_term=walmart+cardstock+photo+cards PDF link annotation
    • https://cdn.sqhk.co/wolitobutak/bdbehbx/maze_runner_maze_wiki.pdfIn PDF document text
    • http://straponartist.com/72714532671t7wmi.pdfIn PDF document text
    • https://gononazenikemad.weebly.com/uploads/1/3/4/4/134482012/e4ec2ede3eaf4.pdfIn PDF document text
    • http://susurrus.space/bintang_bier_logo_free6leje.pdfIn PDF document text
    • http://zootime.store/78577749102bmkt5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481663/normal_5fd0efa4190b3.pdfIn PDF document text
    • https://tutusilubejisev.weebly.com/uploads/1/3/4/5/134599447/bagaxamilukel.pdfIn PDF document text
    • https://fojozotewimoko.weebly.com/uploads/1/3/5/3/135324817/4701249.pdfIn PDF document text
    • https://kujunegisim.weebly.com/uploads/1/3/1/3/131380440/d86959541c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464851/normal_600c7aa02c17a.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/gjaajRl/vugitapogarurope.pdfIn PDF document text
    • http://dezlice.ru/sesogutelop1au7f.pdfIn PDF document text
    • https://xiforamuti.weebly.com/uploads/1/3/4/6/134611992/wosegakolive.pdfIn PDF document text
    • https://cdn.sqhk.co/fijajiles/jjjcrih/battleground_s_survivor_battle_royale_apk_data.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457279/normal_602de1ddbb085.pdfIn PDF document text
    • http://gonzo-3d.com/sufakegotusylch.pdfIn PDF document text
    • http://dazinifuxevoji.22web.org/dice_masters_dd_tomb_of_annihilation.pdfIn PDF document text
    • http://websecurer.tech/how_to_replace_ge_dryer_timer_knobc50qv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://manepiri.epizy.com/dotij.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_off0000cfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBE 5392 bytes
SHA-256: 5a2b02e9bef83e5f9e0e344b16f7556e7e15041351a7b75208ba1b7280e60dd7
font_01_sfnt_off0000e1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F2 10060 bytes
SHA-256: e138e9eb6a59a096b84f164527cc399b2f6194969e097c129fbed1d7e6594e2c

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