Malicious PDF — malware analysis report

Static analysis result for SHA-256 385578df8805d3d5…

MALICIOUS

PDF

69.1 KB Created: 2020-11-13 10:18:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: fe7fad60de7ec395d13d9686fea52927 SHA-1: be3d46467f23066c64338f89a7d03f03d71f8f17 SHA-256: 385578df8805d3d56c34d0e5e1f73e096b5e03fc4df20f60d8d692a845de056f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one prominent URL pointing to 'trafffi.ru', suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to 'Army force games unblocked', likely a pretext to drive traffic to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafffi.ru/123?utm_term=army+force+games+unblocked PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391314/normal_5f9095aa21f1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366402/normal_5fad67a8d4303.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369782/normal_5f8afa2a1a703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393925/normal_5f91bf0011d61.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/sesabifeto-jafavefixoguzo-porukefojek.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/dozafawegikuxoto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ba4071b-756b-4788-a574-4c0daf051d64/zogaxuvim.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/chapter_4_summary_of_a_different_mirror.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/919db732-2958-4d25-9cdf-df53436bd363/meroretokeborezefob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/741ebaf4-bd22-4d84-a78a-b92f3c62d775/jerixime.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/morrell_mushroom_season_wisconsin.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/35582899092.pdfIn 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_off0000cf95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF95 5636 bytes
SHA-256: 5af56c8101052eadf7fbae7d66fe3fa8771a00bf0fd110cb29a14d49fd962447
font_01_sfnt_off0000e2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BF 10988 bytes
SHA-256: 71864cd127525aa9bb52fbc17052b104c2e525ba5c0aa5ab56d241454fac10df

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