Malicious PDF — malware analysis report

Static analysis result for SHA-256 3605c5e40fd025b4…

MALICIOUS

PDF

116.2 KB Created: 2021-02-07 06:50:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fec2706daaa961dbb6d3788e36fb33a1 SHA-1: 9c486b12660cb2e7b08dd0ca1c7b208ca5fd6f91 SHA-256: 3605c5e40fd025b4fa7961dd51210cc7d3beac685fdc57a8a3764a87d432783c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of numerous external URLs indicates a potential for directing users to malicious sites or downloading further payloads.

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://seumenha.ru/aws?utm_term=2009+kdigo+ckd-+mbd+guideline PDF link annotation
    • http://vir-tus.com/old_adventure_games_pch5dkp.pdfIn PDF document text
    • http://bupetud.xyz/into_the_spider_verse_art_book_downloadt4zfp.pdfIn PDF document text
    • http://ergors.space/22706151415u0bei.pdfIn PDF document text
    • https://cdn.sqhk.co/busosuwik/UKYDNdJ/ecology_auto_parts_chula_vista_inventory.pdfIn PDF document text
    • https://cdn.sqhk.co/xipepovivik/cs9YEhh/rivudijese.pdfIn PDF document text
    • https://babixedijifaz.weebly.com/uploads/1/3/5/3/135385025/3634280.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/24968119296.pdfIn PDF document text
    • http://numivonef.rf.gd/watermelon_man_herbie_hancock_sheet_music.pdfIn PDF document text
    • http://wereguvepowu.epizy.com/avengers_infinity_war_trailer_music.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/altered_form_giratina_how_many.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/rukojun.pdfIn PDF document text
    • http://desakoda.rf.gd/atkinson_dam_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/11623238085.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/mozilla_firefox_android_2._3._6.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001916e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1916E 28164 bytes
SHA-256: 4a4228a7f0ae6894e58ba835b2caf69a1076b18351f1b9da9ace1c6e31271987
font_00_sfnt_off000159a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159A6 5348 bytes
SHA-256: 697ee07500aa0920ac3afaa1efb84828c2162507aaf167884617dd29128c77fb
font_01_sfnt_off00016bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BD5 11196 bytes
SHA-256: ca3c4339b07d3e37f31b2752ee4134cf97957f2da00540e5fce1e41409baf2e0

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