Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c659103f2e19bbe…

MALICIOUS

PDF

81.0 KB Created: 2021-05-07 22:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a420c2719aaf7b46ddf659c23db033e9 SHA-1: 4314c4df5d4b130ad236003bcb0578c791ce55eb SHA-256: 2c659103f2e19bbe6219a86ab8a0e17e8c768c931677cc48f610c8c962db43b9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a primary suspicious URL being https://xajibur.ru/strik?utm_term=logitech+g203+lightsync+review+reddit, which is likely used to redirect the user to a malicious site. The document body is heavily obfuscated, but the presence of external URIs and the overall heuristic firings suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xajibur.ru/strik?utm_term=logitech+g203+lightsync+review+reddit PDF link annotation
    • http://ziwegiwe.iblogger.org/mawodivofitirinulokiz.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/relieving_letter_format_from_employer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_6044fcca6a16d.pdfIn PDF document text
    • http://salonly.xyz/41297908668g5stc.pdfIn PDF document text
    • http://whysmall.space/acquired_traits_vs_inherited_traitskjm3z.pdfIn PDF document text
    • http://rumafelaneli.mygamesonline.org/63108034163.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486200/normal_5ff163441d39f.pdfIn PDF document text
    • http://steblin.pro/lowrance_hook_3_power_cable1cvsm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450876/normal_606a981fa4c79.pdfIn PDF document text
    • http://rent-nout.site/84_charing_cross_road_movie_imdbz2x5n.pdfIn PDF document text
    • http://segwaywheelchair.ru/1136168838ewgk9.pdfIn PDF document text
    • http://gubixazolela.sportsontheweb.net/what_is_the_big_star_in_the_western_sky_tonight.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xenezipulugiji.atwebpages.com/79177357911.pdfIn PDF document text
    • http://wozitoso.atwebpages.com/vuvuveju.pdfIn PDF document text
    • http://pepagulax.epizy.com/tetulosi.pdfIn PDF document text
    • http://tipipigi.atwebpages.com/batman_arkham_asylum_comic_espaol.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB48 5624 bytes
SHA-256: 1a14126ffefafa1c33a60501aa8e8abd4ad9a002637d9a788300668f5fa00a0f
font_01_sfnt_off00010e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8F 12176 bytes
SHA-256: 8de8a6cf7b57a9fd6fee294fc8ea2f9845a6819e9aa2a1d0252bfca03a53e3be

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