Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b2756a67e46fb9…

MALICIOUS

PDF

151.8 KB Created: 2021-03-19 08:54:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2789b87e29a9e77ea84b3dbf64b6c82 SHA-1: 7fa2acfe2092ccb3287e1adfb7fca0085d110e66 SHA-256: 31b2756a67e46fb94808bfca4fead22362fbeee3dcfbf1b8b9e0819829e2ca0a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a large number of links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://lozipotod.ru/123?utm_term=android+version+list+a+to+p
    • http://zipubezexupoka.mywebcommunity.org/peavey_classic_50_410_parts.pdf
    • http://mitsumoro.ru/xalalofikofakevomsy1o5.pdf
    • https://cdn-cms.f-static.net/uploads/4418963/normal_6053f0d7b3498.pdf
    • http://rajukilodagoje.mygamesonline.org/mowapu.pdf
    • https://static.s123-cdn-static.com/uploads/4419193/normal_60039c11d4e7e.pdf
    • http://zegererevez.medianewsonline.com/air_force_exam_paper_download.pdf
    • http://xukigebek.iblogger.org/life_fitness_95t_discover_se3hd_treadmill.pdf
    • http://wopizup.mypressonline.com/26358386387.pdf
    • http://firstsecu-paypal.com/9777127262wsact.pdf
    • http://segway-wheelchair.ru/writing_and_illustrating_the_graphic_novel_daniel_cooneyixx13.pdf
    • https://cdn-cms.f-static.net/uploads/4453900/normal_60112c7d7bd6b.pdf
    • http://cmbmarketing.agency/why_is_my_smoke_detector_blinking_red_every_5_secondsbmfz1.pdf
    • http://bomalemudori.iblogger.org/advanced_grammar_and_vocabulary_key_book.pdf
    • http://sushibara.net/29147015099ghctx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/831b8e41-bb03-4aaa-85ac-f27312ad3c3d/75761194061.pdf
    • http://luwulifinuneti.epizy.com/sesuxebegodosa.pdf
    • https://uploads.strikinglycdn.com/files/beaa2dc3-16e5-406e-a677-648221d5f260/damodagexulutolom.pdf
    • https://uploads.strikinglycdn.com/files/6619295a-e141-43a9-8ce6-f44776eeee13/couch_to_5k_treadmill_plan.pdf
    • http://wegolas.epizy.com/boxuzisobepe.pdf
    • http://zekubegem.epizy.com/vabosexokivijasur.pdf
    • http://zujebagita.epizy.com/sig_p226_hogue_extreme_grips.pdf
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000216c3.bin
547de16ed3a638f7eaff73736071aa8baeeefbbd5aba897af65da6ab8344b979		 pdf-font-stream PDF embedded font (sfnt) at offset 0x216C3 5000 bytes
font_01_sfnt_off000227d8.bin
d4382127dc47ab37170b58a498e2f537d82c2e2e12f9118de4ebe8df4a1af004		 pdf-font-stream PDF embedded font (sfnt) at offset 0x227D8 12108 bytes

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