Malicious PDF — malware analysis report

Static analysis result for SHA-256 3383967db35b4ce8…

MALICIOUS

PDF

75.9 KB Created: 2021-02-27 21:50:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 973337c18d8178d1bc70da06d049606e SHA-1: 2ea2dab7df68aa4e110e82b37382a7b07d835c55 SHA-256: 3383967db35b4ce86fdde86ea5485501ebd987c94d594030404af217d8b779b1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML heuristics flag this as malicious, specifically a phishing or trojan PDF. The embedded links likely serve to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://gimoguvi.ru/award?keyword=software+development+manager+jobs+in+singapore PDF link annotation
    • https://cdn.sqhk.co/rubupidorinu/egiKZii/the_legacy_2_prisoner_walkthrough_part_9.pdfIn PDF document text
    • https://cdn.sqhk.co/tivanosox/9HIHgg8/hearts_in_atlantis_trailer_espanol.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolefowi/OhbUhcv/minecraft_game_modes_server.pdfIn PDF document text
    • http://alsamcctv.com/85355106458y914o.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/gxghd1o/tomb_raider_movie_2017.pdfIn PDF document text
    • http://pomirkapa.site/mine_engineering_graduate_jobs33naz.pdfIn PDF document text
    • https://cdn.sqhk.co/najiligopej/hKicqia/xedisivamizopibunuwureni.pdfIn PDF document text
    • https://vobiromab.weebly.com/uploads/1/3/4/6/134653190/vanerepi.pdfIn PDF document text
    • http://freud.icu/large_collage_photo_prints_onlinehxaou.pdfIn PDF document text
    • https://cdn.sqhk.co/voguzasijur/hcGpJig/rabbit_pop_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/at4dkge/history_of_religion_in_america_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://darafefe.rf.gd/fulifun.pdfIn PDF document text
    • http://jipipazed.epizy.com/electric_pressure_cooker_recipe_for_beef_stew.pdfIn PDF document text
    • http://lewafozilit.epizy.com/59169970831.pdfIn PDF document text
    • http://fijesuluxugej.rf.gd/dinagenosutorad.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_off0000ec1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1A 5832 bytes
SHA-256: 43e313e995557eaea14e3ed7fefb4151359b932b381a7b5cf64b1a6e7ffbe38a
font_01_sfnt_off0000fff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF7 10184 bytes
SHA-256: fbbe1b398a0b84586f73d4f4d23ac37c5b5362edb402ccbc80c3563bcf7b6d36

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