Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1e172eb3c4dd71…

MALICIOUS

PDF

84.0 KB Created: 2021-04-01 20:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75a9a4409678c10feaa2bc5fc62b2bc7 SHA-1: 2026b44a9abeb1dc4218262ee21c293ad3f618b8 SHA-256: 4d1e172eb3c4dd715818ebad75ac9bca035b710a5462f239f93b480e9fbaae88
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The presence of an external URI and the ML classifier's high confidence score indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=what+is+the+mood+of+thank+you+ma%2527am
    • http://vofafagame.iblogger.org/realidades_3_leveled_vocabulary_and_grammar_workbook.pdf
    • https://dedotomonifagax.weebly.com/uploads/1/3/1/6/131606429/zalediluro.pdf
    • https://revotifolalowo.weebly.com/uploads/1/3/4/7/134716495/5554988.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dikomavomem/scrivener_3_mac.pdf
    • https://s3.amazonaws.com/pexodugosa/gavubajak.pdf
    • http://tufobiwileke.rf.gd/fagejorufitimaw.pdf
    • http://jevoxomififewi.epizy.com/89321165312.pdf
    • http://gidojujejotimoj.epizy.com/vimeboke.pdf
    • https://s3.amazonaws.com/widuxade/95227753028.pdf
    • https://5db246a0-94da-4013-9f64-c970003367b9.filesusr.com/ugd/ca5179_c262ec22de4f44d19a1b8382b622047d.pdf?index=true
    • http://joxowosikaze.rf.gd/operations_research_masters_canada.pdf
    • https://s3.amazonaws.com/rumezo/glow_and_grow_feedback_template.pdf
    • https://s3.amazonaws.com/gewisetug/52523639086.pdf
    • https://s3.amazonaws.com/jiwisi/tubo-_ovarian_abscess_treatment_guidelines.pdf
    • https://s3.amazonaws.com/gurowozenupifi/27959434695.pdf
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_716f1bb272ea4a93aec56acb4f3c5271.pdf?index=true
    • https://s3.amazonaws.com/kisagoz/fuvibadopomowedes.pdf
    • https://1bf92926-22d0-44a1-94fb-b51843c41cd5.filesusr.com/ugd/762c1a_45a2be945d1b4a5fb3deae9988a79faf.pdf?index=true
    • https://s3.amazonaws.com/najipavez/swann_security_camera_installation_youtube.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fedb.bin
40ce0bc9b113ef031639604f059b60aa9f1e41b097d60e75bfbf620cccc66306		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDB 2900 bytes
font_01_sfnt_off0001091f.bin
d78bb8b1c4ea9eed1bcb81b3b91b407744ea83e96a871e1cadcf73a9609e2f8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1091F 5232 bytes
font_02_sfnt_off00011ae6.bin
fc3e1b406905cf051920314259efb814aeec69125e275df699c098872929d39f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE6 11120 bytes

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