Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc24a5ed8fe342f1…

MALICIOUS

PDF

77.2 KB Created: 2021-02-27 00:55:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 806bef737643010d45a5a3bf54b2a3e3 SHA-1: 90e04208873e5b5a864f029900ae328c2872813a SHA-256: bc24a5ed8fe342f1a928e5b7b1595f05d8901f5f2a711f2033d05908032d7f8e
186 Risk Score

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. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://pelibifir.ru/123?utm_term=where+is+the+drain+filter+on+a+samsung+front+load+washer', is presented in a way that mimics a search result, likely to trick users into clicking through to potentially harmful content. No scripts were extracted, but the overall structure and link distribution indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/123?utm_term=where+is+the+drain+filter+on+a+samsung+front+load+washer PDF link annotation
    • https://cdn.sqhk.co/forinabam/ijge2ib/fosirovud.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/gogojuwosejiremejonabiv.pdfIn PDF document text
    • https://dunegigamirusa.weebly.com/uploads/1/3/1/4/131437715/xuwejikoxajemo.pdfIn PDF document text
    • https://cdn.sqhk.co/fudamozomeb/nOpiyhf/bewugakifurenekefe.pdfIn PDF document text
    • https://tuxufinuzeleki.weebly.com/uploads/1/3/4/7/134737217/pubuzawazutugup-rinote.pdfIn PDF document text
    • https://cdn.sqhk.co/sotisajen/jbibgiC/42220293727.pdfIn PDF document text
    • http://wirobigi.medianewsonline.com/51425159801.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebililofo/hjjb8nn/sub_sandwiches_near_me_open_now.pdfIn PDF document text
    • https://cdn.sqhk.co/zimajigon/bTifgc8/kasatitagufofunev.pdfIn PDF document text
    • https://cdn.sqhk.co/molivovuki/jjAjeha/keep_my_notes_app_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzalolotagi/0AH72ia/zazozog.pdfIn PDF document text
    • https://fometixivoros.weebly.com/uploads/1/3/1/6/131637143/ralud_fukopamige_rovigadiloveke_rebewa.pdfIn PDF document text
    • https://cdn.sqhk.co/jozanafe/TXhjcgj/dbz_battle_of_gods_android_game.pdfIn PDF document text
    • https://zexawowa.weebly.com/uploads/1/3/6/0/136081798/c9159fc8aaed.pdfIn PDF document text
    • https://cdn.sqhk.co/vilitemeru/iahghb5/sneaker_hd_wallpaper_iphone_11.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/certificate_of_origin_form_bangladesh.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/who_is_the_poorest_rich_person_in_the_world.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/indiana_jones_theme_sheet_music_piano_free.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_off0000f035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF035 5428 bytes
SHA-256: e90f7369a143d40534f47b29322e4fe9c1c50b89517d655c64252ee709b70955
font_01_sfnt_off00010296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10296 10772 bytes
SHA-256: b70c014d2b1c1215f2b977d8168937d3ec6e0ccbe2a071ab9c9f822a40fee269

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