Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3001a929181af06…

MALICIOUS

PDF

91.5 KB Created: 2021-03-11 02:03:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 44bc41948442fedd862d2a02030edc8e SHA-1: f9431cb1959de524ae638326c23e03fbeaa79ff9 SHA-256: e3001a929181af06ea843f1bfa35d15f3f84ce44486d1e930bbd8af20f6468a5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or SEO spam document. It contains a large number of external links, with at least one pointing to a suspicious domain (jumiwimov.ru) and others forming a link farm on disposable hosting. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://jumiwimov.ru/wix?keyword=perfect+world+mobile+guide+reddit PDF link annotation
    • https://cdn.sqhk.co/rapovixovuti/czJjhib/lafov.pdfIn PDF document text
    • https://kefonajivivuz.weebly.com/uploads/1/3/0/7/130776591/lemagufu-kewunup-rokifimumu.pdfIn PDF document text
    • https://zuxevuzefadum.weebly.com/uploads/1/3/0/7/130775429/819bbe.pdfIn PDF document text
    • https://cdn.sqhk.co/lilomovetum/qxZ4jd8/mutant_mod_zombie_addons_and_mods.pdfIn PDF document text
    • https://cdn.sqhk.co/bibilofefi/XfD5CHv/xolugalaletag.pdfIn PDF document text
    • https://kuvugelovusilu.weebly.com/uploads/1/3/4/4/134437140/7817949.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_bf5f361b2b7243ff827b11573a630ce4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb1b2c78-38c0-4725-af03-03cff2b697aa/sub_zero_550_dimensions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22d1a34b-bad7-4426-b154-f231513a907d/how_to_fix_printhead_hp_8620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d1b7426-635f-4aae-8cd4-f9832393b6aa/3.5_cleric_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4822cbf6-4dd2-4f3e-bea0-c2c35c206d78/primerica_financial_representative_salary.pdfIn PDF document text
    • https://7b806e58-2e0f-4c22-b5e1-e0f71c4d6e86.filesusr.com/ugd/8da65f_f387153a98f64f25956ca7ee9b3e2faf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/082cf40e-c8fa-42a2-af2f-b89fd098caca/vevidavobezawoledero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d08afc76-3f6b-4cfe-978b-5d051e2735b2/how_to_get_minecraft_1.16_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc39aad2-d1c9-48ed-8f20-187771b3d524/xuramodimuvikoxetawovodo.pdfIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_274129ccb8314397b06cbbed7b772712.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/393a40fb-dc02-4476-9ac1-31f0a043c2de/52953450558.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b0b7b8b-8ce3-4a53-b4ee-f2a94e4c66d5/kobesulifag.pdfIn PDF document text
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_2d0e1a54a9154a25b359dca7c6e59fa4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/95259328-6fe7-4024-b2f2-c4bd17d1c21b/how_long_to_jump_rope_to_see_results.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f7476ca-51c8-4a82-9813-8dfac88e09e9/64588038953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5b8680b-9814-47f7-a4cc-8079c87449ad/it_should_be_ok_synonym.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd65527a-31d5-4aa8-93c0-8e7280d41bbf/star_wars_edge_of_the_empire_books.pdfIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_b86a4209e202410cb2e76cd92c694a1c.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11563 5184 bytes
SHA-256: 4d48d76d42bae66ef8ab5302219cdebcbffce642487866cd6a10d06c138fd76d
font_01_sfnt_off00012703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12703 10472 bytes
SHA-256: 6630535bee2429f6d2e770eac82a67f4646051e32f1077c8fa80e0f5e8a592f5
font_02_sfnt_off00014b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B0C 16096 bytes
SHA-256: 61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2