Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df4fc1d74ce0354…

MALICIOUS

PDF

78.9 KB Created: 2020-11-22 16:24:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3406563dda7844817078a2a68df34cc2 SHA-1: 7a1093fa7b1ab9187f9410603e64de30d9499858 SHA-256: 4df4fc1d74ce0354c64aba5605ea5a698b594ffa4b9a7794b091cc60da9711d4
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 Weebly and other hosting services, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious sites.

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-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://traffking.ru/aws?utm_term=imani%2527+s+fafsa+forecaster+answers
    • https://dawewixorumerix.weebly.com/uploads/1/3/4/6/134633471/vekilizexab-xemerojilaner.pdf
    • https://cdn-cms.f-static.net/uploads/4419205/normal_5f99bc28c7c01.pdf
    • https://kirewigofe.weebly.com/uploads/1/3/4/3/134382955/kerovesumet_lodeme.pdf
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/nopixul.pdf
    • https://cdn-cms.f-static.net/uploads/4389568/normal_5f917f2a5685f.pdf
    • https://cdn-cms.f-static.net/uploads/4387701/normal_5f9890432ab61.pdf
    • https://salabupomisopef.weebly.com/uploads/1/3/4/6/134631393/2e9d68.pdf
    • https://cdn-cms.f-static.net/uploads/4376088/normal_5f98796e49324.pdf
    • https://sizukejagu.weebly.com/uploads/1/3/2/6/132681884/2821895.pdf
    • https://cdn-cms.f-static.net/uploads/4411921/normal_5fb8d572b1fa8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bb86c2bd-83ae-40d8-b7d1-ba0e1b585178/kirk_franklin_lyrics.pdf
    • https://s3.amazonaws.com/gozilum/gasisiponebudeviki.pdf
    • https://uploads.strikinglycdn.com/files/ae9c95a0-c742-42b7-95f7-bcdf3622d829/9599980990.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_off0000f6a5.bin
4fd54f484248b08060c7ea98d68de1bdf389bd12afef8b9d417a5d4242b7f15b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A5 5060 bytes
font_01_sfnt_off000107d8.bin
32610fbb858a5507de461c12f2f0c9ceebecf85b1dccb98f2ec7704edc839a8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x107D8 11524 bytes