Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f88989315a07075…

MALICIOUS

PDF

75.9 KB Created: 2021-04-10 11:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25a227fccb9769b95651d36dd2e4c033 SHA-1: 2df8a9899d3701f7209282584757f013066cee81 SHA-256: 6f88989315a07075a70d3b6439cf4dc16f0bd26d6aa62270f2ddd0091e250ff5
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, which is a common technique for SEO manipulation or distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest an attempt to redirect the user to potentially harmful 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://vilenefex.ru/strik?utm_term=aeron+chairs+dimensions
    • https://cdn.sqhk.co/dabebasavus/jeicgel/voxorox.pdf
    • http://xubanapirobula.mypressonline.com/kavevu.pdf
    • https://budaxopam.weebly.com/uploads/1/3/4/7/134711784/rekinilag-lapepem-gupolinadedekej-vediropofujujod.pdf
    • https://cdn.sqhk.co/sowanigog/ejdljgh/78860756834.pdf
    • https://cdn.sqhk.co/rizuwevize/jgCQvhf/nfl_network_fantasy_football_ppr_rankings.pdf
    • https://cdn.sqhk.co/puzadowoke/jeSFfLS/airplay_app_iphone.pdf
    • https://likuxosudiva.weebly.com/uploads/1/3/4/6/134603152/vobuxojod_jabufotoxodader_lebumamubami.pdf
    • https://wiperorapaxomun.weebly.com/uploads/1/3/5/3/135323561/gibowuwusikaf.pdf
    • https://kaxogirigajel.weebly.com/uploads/1/3/4/6/134611066/14e25.pdf
    • https://sezorataxij.weebly.com/uploads/1/3/4/6/134600708/titetafatomiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://runuwug.myartsonline.com/durusebepat.pdf
    • https://56352102-112a-4456-a677-0775450c4ed3.filesusr.com/ugd/ed4e87_5a377969a6f04a718cbc1d740d39cefe.pdf?index=true
    • https://s3.amazonaws.com/tomamujuf/megobadepidixadotujakemo.pdf
    • https://s3.amazonaws.com/zonivezada/second_conditional_type_2_worksheet.pdf
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_1b4f7145431c42678f59008a2eb470ff.pdf?index=true
    • https://de461234-8179-4892-b46d-67dc01ae00af.filesusr.com/ugd/69bbc5_156ab05364044287ba1bc88412991e48.pdf?index=true
    • https://s3.amazonaws.com/vezumobigodub/printable_blank_monthly_calendar_template.pdf
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_4924fc9938434cc5bb8d72e1138680a9.pdf?index=true
    • https://s3.amazonaws.com/genedonapubefe/33105958172.pdf
    • https://s3.amazonaws.com/sewamos/hotel_franchise_agreement_template.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_off0000ecbb.bin
e41958698231f12fca27a534407f14fd7c432e1f6a8a2d34054bfa5ebcd6d18d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECBB 5136 bytes
font_01_sfnt_off0000fe01.bin
755899357813894af3cb29f0a70e74bd3c84846cdc48210a66c4817819308a07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE01 10716 bytes

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