Malicious PDF — malware analysis report

Static analysis result for SHA-256 039f96a09b3c4025…

MALICIOUS

PDF

77.8 KB Created: 2021-05-28 12:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8ad4d2fe7ab904278c596584224e8ad SHA-1: 6272515f23840c900cbd0026345da90cb14c3b96 SHA-256: 039f96a09b3c402592f4ce61d43b91eb310069ce97bb31f6e2a5873a2f195951
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on file-sharing services, indicative of a link farm or SEO poisoning tactic. One of the primary external links, https://jacksth.ru/strik, is likely a malicious redirect. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=market+risk+analysis+carol+alexander+pdf
    • https://zegesunipatobas.weebly.com/uploads/1/3/1/3/131379774/7788206.pdf
    • https://cdn-cms.f-static.net/uploads/4424364/normal_604802ddc7907.pdf
    • https://tuboxivodase.weebly.com/uploads/1/3/4/3/134387713/togakevalemefa_zopoja_tunapib_gidemiluxeg.pdf
    • https://govenovu.weebly.com/uploads/1/3/4/7/134701044/98ab14.pdf
    • https://xunujilitaga.weebly.com/uploads/1/3/5/3/135315779/1644588.pdf
    • https://jalesebexiw.weebly.com/uploads/1/3/0/7/130739560/1dbce30.pdf
    • https://nezijolumuka.weebly.com/uploads/1/3/4/0/134016970/wepemidisudawesu.pdf
    • https://bijariruxo.weebly.com/uploads/1/3/1/3/131382387/d19df6.pdf
    • https://cdn-cms.f-static.net/uploads/4426828/normal_600ab9bdaa78e.pdf
    • https://bidopafogusiw.weebly.com/uploads/1/3/1/0/131070115/1a8c148b.pdf
    • https://didowaxa.weebly.com/uploads/1/3/4/3/134387091/e14273a0d.pdf
    • https://bivufinemena.weebly.com/uploads/1/3/1/3/131380184/e61764bf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/36555fa3-5b22-49e3-b3e8-b9ff1ece5e40/king_warrior_magician_lover_barnes_and_noble.pdf
    • https://uploads.strikinglycdn.com/files/89f96a7b-f1bf-4950-af20-4e1bc42c3187/think_pair_share_strategy_lesson_plan.pdf
    • https://uploads.strikinglycdn.com/files/dd7aae20-908b-4bec-9725-740d15d97854/original_jawbone_jambox.pdf
    • https://uploads.strikinglycdn.com/files/30fbac48-3287-4a69-8a1f-c5252a13396f/is_there_a_grace_period_for_dot_medical_card.pdf
    • https://uploads.strikinglycdn.com/files/f42b3830-b73c-46df-b091-409b22e8836c/how_to_lift_weights_at_home_without_equipment.pdf
    • https://uploads.strikinglycdn.com/files/3ca567e0-12b7-47b3-b949-80b41ba3061a/42368304048.pdf
    • https://uploads.strikinglycdn.com/files/943d31c1-6cd9-4187-bee9-a2d406930fcd/idt_audio_driver_windows_10_dell.pdf
    • https://uploads.strikinglycdn.com/files/4dc4e14d-8923-466c-985a-a169fa346985/how_to_use_copper_brownie_pan.pdf
    • https://uploads.strikinglycdn.com/files/a70c9bee-e5c4-4fd6-b84e-28be9f9c8c32/vixagiwaxupekarutilubu.pdf
    • https://uploads.strikinglycdn.com/files/0d186e71-98b8-414f-8090-dd53426f1f9b/how_to_solve_inverse_proportion_problems.pdf
    • https://uploads.strikinglycdn.com/files/6001498c-bba3-4ab0-beca-15deea218eb8/how_to_get_a_drivers_learners_permit.pdf
    • https://uploads.strikinglycdn.com/files/8a5085f4-48d9-4b6d-8b2d-95a03a6c91f3/rexanorejorew.pdf
    • https://uploads.strikinglycdn.com/files/d4c89f29-b29e-4557-ac98-e50c8e4ae277/5273730001.pdf
    • https://uploads.strikinglycdn.com/files/3f250bcf-de25-4c95-a4e2-d9bd12641450/89740356554.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f15f.bin
78b6634e18efdaac940d8fc74e9b2d8715bd19d41e2374fd1c7f4219c18b8704		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF15F 5388 bytes
font_01_sfnt_off000103e2.bin
c4b7281d7329404c8e0b782f82af604d25ae5dbc3f28bc5ff8e4cdafd2ea3b5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103E2 11072 bytes

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