Malicious PDF — malware analysis report

Static analysis result for SHA-256 50bfbd1a97521ebf…

MALICIOUS

PDF

74.5 KB Created: 2021-03-16 17:41:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f66840a77c632b1af7b2f5545d4055b8 SHA-1: 4ece53bb2ff669832828805ebf94bf9512e15237 SHA-256: 50bfbd1a97521ebf3c7f03b8bde8551881ed7be0723a63bbf54c266fe62b1b6a
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/wix?keyword=ritual+bindings+fallout+76 PDF link annotation
    • https://cdn.sqhk.co/virixerusupa/1PGgeib/gabokogubefomi.pdfIn PDF document text
    • http://bizbize-yeteriz.org/bavetegalejo1ti5.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwovado/wJhizhf/ranowujojurekaduton.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopiroxab/glij2Qk/parasezatonazuburogug.pdfIn PDF document text
    • http://milky-rp.space/commando_2_full_movie_300mb8bn4y.pdfIn PDF document text
    • https://cdn.sqhk.co/xobupiba/agjjcZs/slayer_leecher_2018.pdfIn PDF document text
    • http://biwiroxefamir.mywebcommunity.org/brandon_sanderson_wiki_software.pdfIn PDF document text
    • http://wipunemobak.mygamesonline.org/characteristics_of_social_science_research.pdfIn PDF document text
    • https://cdn.sqhk.co/jujejorule/dhjfWgi/xakosebolutagevuwag.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/iiihgiY/license_plate_game_checklist_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/jzQhggc/deus_ex_goty_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/rezebarowed/hbgdbha/70262718541.pdfIn PDF document text
    • https://cdn.sqhk.co/widobixi/gfjeJii/becky_from_the_block_song_free.pdfIn PDF document text
    • http://kieverts.xyz/devizutobaviwaxuwobp6xe0.pdfIn PDF document text
    • https://cdn.sqhk.co/sovixojer/ieaEYhf/47435612362.pdfIn PDF document text
    • https://cdn.sqhk.co/sepagumal/gghgjcp/virus_wars_game.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/4XjaWpf/verydice_hacks_for_free_rolls.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/UzqoLUe/yeezy_700_v3_alvah.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_6ac56c506d9643d19f3733f0be17572e.pdf?index=trueIn PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_2061bf94d26949dfa140d36de7e3f9d5.pdf?index=trueIn PDF document text
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_b0d4d2866c6c403c94b5b7bfde74347d.pdf?index=trueIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_3de1b2792ede4f32a11bddefa15c42ad.pdf?index=trueIn 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_off0000e44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44C 5360 bytes
SHA-256: 2f4ce888886a5f42d5ecdd5ac866d05a1c69958fed60cdf54af2d5e1bcdfae57
font_01_sfnt_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 11312 bytes
SHA-256: 981984b15514ad73f0fe343d01c42d1887b13a7a63779ef6a5a4f2a2d0a5cafb