Malicious PDF — malware analysis report

Static analysis result for SHA-256 832a5073c50ddadd…

MALICIOUS

PDF

77.3 KB Created: 2021-05-01 20:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3947c441743f259912b94c81418c484b SHA-1: 2024c4447ae1466763cb5453add9d76ac80926d6 SHA-256: 832a5073c50ddadd20201d4ae4cc6ce2be83a433c8cacc2487f49c7babd07c29
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, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier strongly indicate maliciousness, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/strik?utm_term=equal+rites+kindle PDF link annotation
    • https://maparezoja.weebly.com/uploads/1/3/5/3/135321508/d6cc5.pdfIn PDF document text
    • http://busurman.space/pottery_barn_teen_desk069ey.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454171/normal_60625914c5da6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426820/normal_5fcbb4d4bdb55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421630/normal_5fe4fef45bc87.pdfIn PDF document text
    • http://bonifacy.site/bovogejagijef3zump.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454435/normal_60067813b42f8.pdfIn PDF document text
    • https://cdn.sqhk.co/pakebisas/Aiaijie/facebook_app_installer_do_i_need_it.pdfIn PDF document text
    • http://invitesistem.ru/nikon_s9300_manual0hqdk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377377/normal_6037241855894.pdfIn PDF document text
    • https://cdn.sqhk.co/xagegegozi/f2Giajh/88110338233.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454287/normal_5ff2b1e2b7e17.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/vXWjcIA/mapebojotateza.pdfIn PDF document text
    • http://instup.xyz/61885758465xmu0k.pdfIn PDF document text
    • http://autocredit.moscow/how_do_you_calculate_prevailing_wageey958.pdfIn PDF document text
    • https://cdn.sqhk.co/kilalovuge/jege5kc/space_commander_game_ios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416149/normal_60224b7a5a43c.pdfIn PDF document text
    • https://cdn.sqhk.co/kekagate/5AZjjfj/surah_al_shams_arabic_text.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470526/normal_5fe2197eca81d.pdfIn PDF document text
    • https://mozimokitazipa.weebly.com/uploads/1/3/1/4/131407977/naxupozemuba.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/kiguteperilodu/21407112847.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/application_format_for_leave_from_job.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/mopebom.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_off0000f23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 4964 bytes
SHA-256: 5ba23df54a37d0cd08024596fc01b2003d394e6b95bdfa96da18d304bbd3d11b
font_01_sfnt_off0001032e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 10820 bytes
SHA-256: b8b34e5c29996d5ac75611e3c32994626476ea50dc91013363f954b46b72471d

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