Malicious PDF — malware analysis report

Static analysis result for SHA-256 513802e25251d1f7…

MALICIOUS

PDF

77.2 KB Created: 2021-03-14 18:22:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 78643884eeb3679e1a3bd0ea35efb788 SHA-1: 99c67de207cd1d9d176582aabb30175ac8b60292 SHA-256: 513802e25251d1f7d7f87db6d1b8c41f2a4cd0cfe352c57c6aff2072774af289
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://dugedepap.ru/wix?keyword=lincoln+movie+guide+answers PDF link annotation
    • https://binazinir.weebly.com/uploads/1/3/4/1/134108718/diruwinapip.pdfIn PDF document text
    • http://skidki-day.site/9341536102428nt1.pdfIn PDF document text
    • https://kigekasomek.weebly.com/uploads/1/3/4/5/134598498/86fc534ef.pdfIn PDF document text
    • https://zupalopozaguri.weebly.com/uploads/1/3/2/3/132302876/3790804f9f0997b.pdfIn PDF document text
    • https://zufefofavenubu.weebly.com/uploads/1/3/0/7/130775539/6737246.pdfIn PDF document text
    • https://pareniwidof.weebly.com/uploads/1/3/5/3/135313819/d1806d7f3b74.pdfIn PDF document text
    • http://bcpzon4segurabetaviabcp.com/67274428983va45a.pdfIn PDF document text
    • http://gvidilon.ru/adblock_plus_pour_chrome_android009a0.pdfIn PDF document text
    • http://yourlivehelp.com/vegolitiriwa25f.pdfIn PDF document text
    • http://imedo.ru/why_is_my_laptop_charging_light_blinkingug98e.pdfIn PDF document text
    • https://wolixakeju.weebly.com/uploads/1/3/6/0/136002716/0108279.pdfIn PDF document text
    • https://falijufik.weebly.com/uploads/1/3/5/3/135349852/sojitupep_gerutiwigejaf_texakozusilojob_tisoserezowebe.pdfIn PDF document text
    • https://vorexumezekadan.weebly.com/uploads/1/3/0/9/130969740/5765630.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_4ca31408ea8d47cfa7e49b94ddd0259d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/35dcb4bd-b40b-4f69-843b-9cf496c1506d/37805365019.pdfIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_be278ce6de474964a24e360eb31112c0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/47b0850f-fdb9-46d6-b705-3892af93df7d/dojumezofiropego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17a2e71f-f489-4473-ae4c-93647ca0efaa/does_family_dollar_sell_fish_supplies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a4d0332-ff22-4190-9e18-374527d700e2/1996_polaris_magnum_425_4x4_parts.pdfIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_8c4fd5ad1d1347f88d5e427aace7dc46.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d321a680-b499-44f9-b8c0-46d0b28ab188/falekom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f87842ea-7b91-47c6-80ef-d35ab97ebd41/how_to_two_step_with_spins.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c975d40f-d86d-42be-9bb3-2a34f7c17c78/blue_team_handbook_incident_response_edition_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a750860-b59d-4038-8bb8-3b7e8fa89d59/skyjack_4740_scissor_lift_specs.pdfIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_3fc56112b1224c7da2f16a3575283de7.pdf?index=trueIn PDF document text
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_9c2dd34d75dd4e0797a58ffb381cfa5b.pdf?index=trueIn 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_off0000ee5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5E 5352 bytes
SHA-256: a50321aebbaaa7acd63a127c79cc0045b603696007f7ae8e34c6ad37dfe73001
font_01_sfnt_off00010091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10091 11380 bytes
SHA-256: 676dd8b348e5efe41e2ed6602d4657123098baaf82f01b244356d1b109273ba4