Malicious PDF — malware analysis report

Static analysis result for SHA-256 769128d6abc93f1f…

MALICIOUS

PDF

62.5 KB Created: 2020-12-24 03:45:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1384e8aef7287e4fb45feb448a33e9ab SHA-1: 2d4a84ca155423052e5852d27d8e06300ef6b98d SHA-256: 769128d6abc93f1f7b0802eba3edac4b93c662923d649b48f0b9c4e3c6859518
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ggtraff.ru/strik?utm_term=fey+wyvern+gem+mhw+farm'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including 'https://s3.amazonaws.com/jepinebawo/wesojozakiwemu.pdf'. The ML classifier strongly flags this PDF as malicious, and ClamAV also detects it as 'Pdf.Phishing.Trojan'. The document body is heavily obfuscated, but the presence of these indicators strongly suggests a phishing or malware distribution attempt.

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/strik?utm_term=fey+wyvern+gem+mhw+farm
    • https://mimitokiwunas.weebly.com/uploads/1/3/4/0/134012498/nofuvomez_zizobuwazavit_kedudimigilufi.pdf
    • https://xatomurukazaj.weebly.com/uploads/1/3/4/3/134378662/garotareketa.pdf
    • https://jodajapiguzok.weebly.com/uploads/1/3/2/7/132710756/rebojewove.pdf
    • https://nipetetoxijekuj.weebly.com/uploads/1/3/4/7/134718304/bajirejebumevax_tufekegodoxegel.pdf
    • https://komuwewolidixat.weebly.com/uploads/1/3/4/8/134871085/4737741.pdf
    • https://tunomofezu.weebly.com/uploads/1/3/2/3/132303147/ce5af.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jepinebawo/wesojozakiwemu.pdf
    • https://uploads.strikinglycdn.com/files/e47f673d-9d1d-41d3-a753-016cf88a0438/dopuka.pdf
    • https://s3.amazonaws.com/didowugorokirug/cloudformation_userdata_cfn-_signal.pdf
    • https://s3.amazonaws.com/vobuturinivi/52797698446.pdf
    • https://uploads.strikinglycdn.com/files/b4b002dd-9c63-451c-9cda-a33a0157e53a/inde_gda_hazrlama.pdf
    • https://uploads.strikinglycdn.com/files/55ef6069-e1ad-4ab0-a4fb-b9cce2bfbc60/47021367762.pdf
    • https://uploads.strikinglycdn.com/files/212975c2-c651-4d2e-beaf-7838e346ac32/jejojo.pdf
    • https://s3.amazonaws.com/pesetufavo/dengue_cdc_fact_sheet.pdf
    • https://uploads.strikinglycdn.com/files/a619819e-3275-4a99-91e9-b8e91f78953a/49994281074.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_off0000b752.bin
3909ebdb2984872bd7aeb443345c2af19d163f76a67d55fec78acf32a00f5470		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB752 5180 bytes
font_01_sfnt_off0000c8ed.bin
4b31c6d2888a1432334db3e0c65e3b87fb3f982a31c8ab86cb42db6dfea9d33a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8ED 10660 bytes

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