Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd7b9ce6be29b46…

MALICIOUS

PDF

80.3 KB Created: 2021-06-04 14:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58e79380f921ff01a4c301ce5f8faa58 SHA-1: def54723f3c5fbfa8373bbcf18a93c2ff2384f81 SHA-256: 4fd7b9ce6be29b46b04dba57245ca0c7268c1377cde84c3f5247f22769f7cdc4
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and has been flagged as malicious by ML classifiers and ClamAV. The embedded URL and document body suggest a lure to download a game, which is a common phishing tactic. Although no scripts were explicitly extracted, the PDF structure and malicious indicators point towards an attempt to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crewmak.ru/pbw?utm_term=angry+birds+seasons+game+download+for+pc+full+version
    • https://tiwudusakuwizir.weebly.com/uploads/1/3/1/6/131637104/wewude.pdf
    • https://cdn-cms.f-static.net/uploads/4476420/normal_605fb5bc6c672.pdf
    • https://nekurunezofadi.weebly.com/uploads/1/3/4/8/134892804/260753.pdf
    • https://vavirewafikeja.weebly.com/uploads/1/3/4/4/134402836/vunojob.pdf
    • https://cdn-cms.f-static.net/uploads/4450625/normal_6033e0c46bf73.pdf
    • https://cdn-cms.f-static.net/uploads/4371246/normal_6014f5aea901a.pdf
    • https://toziraza.weebly.com/uploads/1/3/4/5/134506396/4a7887abade526.pdf
    • https://kovibokasekur.weebly.com/uploads/1/3/4/8/134880184/3e83ec318.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/08eb6638-8c16-46c4-b050-e81e2cc796f5/hampton_bay_ceiling_fan_replacement_light_switch.pdf
    • http://jetipufagi.pbworks.com/f/brothers_full_movie_telugu_surya_watch_online_movierulz.pdf
    • http://redelaw.pbworks.com/f/16970971913.pdf
    • http://jajisaparev.pbworks.com/w/file/fetch/144419406/25730869029.pdf
    • http://tozuxexap.pbworks.com/w/file/fetch/144517671/23484198654.pdf
    • http://taxexuwej.pbworks.com/w/file/fetch/144432372/bloons_tower_defense_5_flash.pdf
    • https://uploads.strikinglycdn.com/files/39fb6ae8-b4f6-416c-8d3c-4276ec7b237f/tofivufedewuwuvokumala.pdf
    • http://juvudibip.pbworks.com/w/file/fetch/144582810/nenekeliwopikixipisel.pdf
    • http://lopofemusun.pbworks.com/f/top_eleven_mod_hack_apk.pdf
    • https://uploads.strikinglycdn.com/files/077ff97f-bf3f-4bcd-88b5-21de3ef03e68/91313021571.pdf
    • https://uploads.strikinglycdn.com/files/7d41f4bd-5232-458c-bfce-d3d2a45c3575/dukokuvizof.pdf
    • http://sowenux.pbworks.com/f/toefl_structure_and_written_expression_practice_test.pdf
    • https://uploads.strikinglycdn.com/files/87daa901-cfe5-4bb1-a46d-720142186ae1/tulefosodadivaxunaz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec7b.bin
fd4501ad2fdb5fbd7b706abd2b1ee942a8d4031d8018d7091a5a0eae74b1a200		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7B 5660 bytes
font_01_sfnt_off0000ffae.bin
8ceb56eb2fb03f2170753d1e407eabefe5100c8316b00b0702f293f8042af7ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAE 10456 bytes
font_02_sfnt_off00012373.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12373 4324 bytes

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