Malicious PDF — malware analysis report

Static analysis result for SHA-256 9855ddd7f7dd233a…

MALICIOUS

PDF

68.1 KB Created: 2021-03-28 11:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6cab4dfc0ff44cb3a7045f210bb2a3e6 SHA-1: bd4ab218d136bdca520a3d26803c8bd8341eb134 SHA-256: 9855ddd7f7dd233aa110a70f5c5655acb81b1e7d9ceecf7d6eb0e35ba8505443
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting an attempt to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=letter+a+tracing+worksheets+for+kindergarten PDF link annotation
    • https://cdn.sqhk.co/bikegola/cgRigIZ/43662013923.pdfIn PDF document text
    • https://cdn.sqhk.co/tuvameboroke/hiUgfmA/escape_the_prison_game_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/kipebakebe/tcujhij/38147166895.pdfIn PDF document text
    • http://xalebiru.iblogger.org/mawunekemaxoparibulapop.pdfIn PDF document text
    • https://cdn.sqhk.co/leperanurosi/cgiRcgc/ragesiwatowone.pdfIn PDF document text
    • http://xelibirujegid.mywebcommunity.org/71142780009.pdfIn PDF document text
    • http://bawagel.22web.org/98195691310.pdfIn PDF document text
    • https://cdn.sqhk.co/burexewejam/gjx5qBl/78203212412.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/u0fG9jd/meme_wallpaper_hd_1080p_for_pc.pdfIn PDF document text
    • http://potuxoposutu.medianewsonline.com/javascript_cos_to_degrees.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/36253ab0-25e5-4a3e-94e3-1fe90dea0a61/where_does_it_say_in_the_bible_the_truth_will_set_you_free.pdfIn PDF document text
    • http://duvodix.myartsonline.com/3516611648.pdfIn PDF document text
    • http://betakudo.atwebpages.com/dizeno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d44a1314-3bcd-4a31-9cad-2b0e323f9d66/74309160487.pdfIn PDF document text
    • http://nonulalomijowo.epizy.com/bidigufapepugevoguwadar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/233faa87-f2cd-451f-821f-517ec5f1bb67/history_of_islam_in_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a361758d-64ba-4bd7-bba4-6a1e08a708ef/lista_de_verbos_regulares_mas_usados_en_espanol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cc465db-972c-4f6f-9418-1bf5e374573b/dikavavabavegejakago.pdfIn PDF document text
    • http://gevitejivojo.rf.gd/darkwing_duck_episode_guide.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_off0000cb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB95 5348 bytes
SHA-256: ce9b869813b301ab0270da90e6bd9dbb5be2d3a80e0cc3d4768a1f9ac19c516c
font_01_sfnt_off0000ddd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD7 10372 bytes
SHA-256: e981dea1f23ee1dd2fe79ba38f6b84af458b8a7331a41e40110f4d97c16a29b3

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