Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3dce0ae723afda4…

MALICIOUS

PDF

80.0 KB Created: 2021-03-25 01:52:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 744492335baef776cd3dead28c7abea3 SHA-1: 4723cb961c9177018dae3cd7b4a6a83046a5967c SHA-256: c3dce0ae723afda4f2e2a2a447ffc5a9e76d28d8a03f16ebb7777f1daed3f9a8
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this as a phishing or malicious PDF. The embedded URLs are likely used to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bologen.ru/award?keyword=excipientes+farmaceuticos+pdf PDF link annotation
    • https://cdn.sqhk.co/goduwonon/gcwiixW/battlelands_royale_iosgods.pdfIn PDF document text
    • https://cdn.sqhk.co/sivefuxonix/gehhhjk/novixuxuvikolubure.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/gj7qHjv/mapulewazepamesebiwosuta.pdfIn PDF document text
    • https://cdn.sqhk.co/tunixomaj/8ExhiOk/faninejivutagaligap.pdfIn PDF document text
    • https://cdn.sqhk.co/kufalavoxig/giifegf/syfy_channel_tv_series_list.pdfIn PDF document text
    • http://lalojit.iblogger.org/sims_3_super_patch_1.67_mac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_b35ddf6aa4534bdeb2e079fd1e432934.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fofeguj/9725532072.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/how_to_find_angle_measures_of_a_triangle_in_a_circle.pdfIn PDF document text
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_f89c49b3f26f422babced32d072e55d6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/25d26d3e-c142-49b5-a00a-303e2745f9e1/c_bangla_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42ce66a3-e4b6-4608-9cae-f4b3af78a330/soredujodife.pdfIn PDF document text
    • http://bodagoge.epizy.com/felogememed.pdfIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_7be3cb9da9014c75a5c7ae9b45326f7b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2b579ac-ea63-4202-b327-d46e5ab9c8e4/listen_to_a_history_of_the_world_in_100_objects.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/why_do_they_need_handmaids_in_gilead.pdfIn PDF document text
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_121642dc91b64fcaa5c663aef660a064.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/46eb5218-c61d-4993-936a-23bc9118ed20/diccionario_espaol_portugues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc1836ab-c02c-47a7-b9d5-90ff985945a2/88150315665.pdfIn PDF document text
    • http://jirofoxijesev.epizy.com/23672869218.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/165a117f-760f-47fc-8f20-0a8de94ccf06/can_scoliosis_cause_hip_impingement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65455d38-ee72-4a66-bef8-16eaef997ad1/71868668808.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED82 5176 bytes
SHA-256: 7b31b46f806f2f7da0f6d2ff7cfee38b36cbbd57317f441b425b603f68191934
font_01_sfnt_off0000fefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 11024 bytes
SHA-256: 142d32961f1075f83f9c40b6bb4b8fee526f02c547ca989dc2e278ad8ec0dc03
font_02_sfnt_off000122e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E0 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e