Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea3dcd34e936e51…

MALICIOUS

PDF

80.1 KB Created: 2021-04-18 21:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43e4a2dfcfe22dccc9a1c68027609903 SHA-1: 5b39e03ff6b265294b5cc2cef41796916b385721 SHA-256: 4ea3dcd34e936e51f8349ee872e7786d807ab0780bb797e3ce823aff4f5c0894
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The presence of a large number of external links, specifically identified as a 'PDF_SEO_LINK_FARM', suggests a tactic to drive traffic to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/strik?utm_term=wizardry+vi+bane+of+the+cosmic+forge+snes
    • https://cdn.sqhk.co/samofetob/dBEsCjd/90383262985.pdf
    • https://makezuxakoje.weebly.com/uploads/1/3/0/7/130739015/nesovevuvepeze_jolam_niwitar.pdf
    • https://linepofikoleku.weebly.com/uploads/1/3/4/4/134492010/4ef92119e9.pdf
    • http://mixit.info/26_week_money_challenge_printable_201953dv9.pdf
    • https://jevamupoledi.weebly.com/uploads/1/3/4/7/134712268/mesawurizanizi.pdf
    • http://shtampshop.ru/33973986920a1p36.pdf
    • https://cdn.sqhk.co/laxegipo/hjjfijR/89696455423.pdf
    • http://nesobaka7.xyz/yardman_snow_blower_partspknow.pdf
    • https://cdn.sqhk.co/janawezexoj/Epxmiaa/ending_tenancy_letter_template_uk.pdf
    • http://jarobadut.22web.org/31599620053.pdf
    • https://pudisemibupar.weebly.com/uploads/1/3/4/0/134096773/26cd4.pdf
    • http://miwopejodap.iblogger.org/65599436959.pdf
    • https://cdn.sqhk.co/verexumifo/ihhIhft/95969769311.pdf
    • http://xalebiru.iblogger.org/1315944533.pdf
    • http://sushibara.net/93221845103uugvc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_d94e6f7be5fe42ad9119c99dd05a11ef.pdf?index=true
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_69ea5007e78842b6a56cdb9f5a7dd7d5.pdf?index=true
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_c62a749274534e3d83dae5973de7a7a8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fb6f81e6-7d64-49d5-b06f-cd5fb632978b/resumen_del_libro_cazadores_de_sombras_ciudad_de_hueso.pdf
    • https://uploads.strikinglycdn.com/files/92b59c06-085c-43fd-9a14-62ddea5e92a4/the_bell_jar_banned_book.pdf
    • https://uploads.strikinglycdn.com/files/5c112b54-db51-4027-9fa1-1e72db10b389/31902164932.pdf
    • https://uploads.strikinglycdn.com/files/4338721a-6f4b-41d2-bdb0-4a78cb3a93e5/wing_chun_kung_fu_home_study_course.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_off0000fb84.bin
3f42595ecf47fd8af4b94d7f6a6ece8ee5b1e21ae40e518a034c0728176e4da7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB84 5768 bytes
font_01_sfnt_off00010f1d.bin
371b45793a26378e1cc01de15f2d81bfc38b1cca36224b36b9ac09fb141a5d91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1D 10520 bytes

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