Malicious PDF — malware analysis report

Static analysis result for SHA-256 0119bd88f3771bb2…

MALICIOUS

PDF

69.5 KB Created: 2020-12-05 20:56:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6e4ce8aedcbcbd28110a4a37aa5eaac SHA-1: d3c77c319c788bc69c8711cdd6b5a3ab076b2cdc SHA-256: 0119bd88f3771bb2d65460d675132be0a169e6097d6e9a6c90948336edcd7611
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves luring users to malicious infrastructure via embedded links, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://ggtraff.ru/123?utm_term=digital+fundamentals+with+vhdl+floyd+pdf
    • https://dimejozetef.weebly.com/uploads/1/3/1/0/131070151/0cd6cf.pdf
    • https://sozatoma.weebly.com/uploads/1/3/4/4/134484551/mojebesebiva.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a6e97810-5536-4a88-96fc-262a0417cea2/vasunifuxinos.pdf
    • https://static1.squarespace.com/static/5fc7b186d8c3650128394363/t/5fc806618824a265ced0bfe3/1606944356591/classical_music_for_baby_funeral.pdf
    • https://s3.amazonaws.com/jarawaxanivu/27794675810.pdf
    • https://static1.squarespace.com/static/5fc64fa9403f5353fdba673b/t/5fc70b4db2fa4660c8ca99f8/1606880078740/xivijifo.pdf
    • https://s3.amazonaws.com/pibajuwi/27872244860.pdf
    • https://s3.amazonaws.com/pizivurapab/27545718948.pdf
    • https://s3.amazonaws.com/suxuzubojut/50109033240.pdf
    • https://static1.squarespace.com/static/5fc3676dc6d96458363207a7/t/5fcb13bf36758319a54cdc6f/1607144385694/nedubirizavejoxegumig.pdf
    • https://s3.amazonaws.com/sedimeraxufi/xarozonukazasujaz.pdf
    • https://static1.squarespace.com/static/5fc0e701bda9c57a97be38be/t/5fc0f7765147b14804565d36/1606481783058/related_rates_cylinder_examples.pdf
    • https://s3.amazonaws.com/fadedosi/2051629049.pdf
    • https://s3.amazonaws.com/goviwigax/ac_market_apk_4._0._5.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_off0000d342.bin
7266d62576ae2e5ec540e5d11a4419be7a38249bb0e2ce91a8a71988d20850ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD342 5612 bytes
font_01_sfnt_off0000e66c.bin
b7cd4472e4653e54d973c642f92d44db37fb5ed6f5e20c10d26ef0299c518dfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE66C 10276 bytes

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