Malicious PDF — malware analysis report

Static analysis result for SHA-256 c041a2cf32d4375e…

MALICIOUS

PDF

79.4 KB Created: 2021-02-24 02:50:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4595ec7e90b85f7149ec21d8828d335c SHA-1: d56966f0fbfcc2b4b576991e089c1dc4ed777421 SHA-256: c041a2cf32d4375e97661c9704c634ead582d929d9d0aed67622d43f41361f67
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URL 'https://baarspo.ru/strik?utm_term=what+is+the+theme+of+the+golden+kite+the+silver+wind' is a primary indicator of the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://baarspo.ru/strik?utm_term=what+is+the+theme+of+the+golden+kite+the+silver+wind PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461216/normal_5fe78eceae6e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473049/normal_6023e441f280b.pdfIn PDF document text
    • http://netewe9.xyz/lujunoluromiol6l6.pdfIn PDF document text
    • https://musekakilex.weebly.com/uploads/1/3/1/4/131406804/tozirivo.pdfIn PDF document text
    • https://cdn.sqhk.co/kufagilan/hdRgcjh/rapunzel_disney_dress.pdfIn PDF document text
    • http://boevoenlp.com/shambhala_guide_to_taoismoi3ys.pdfIn PDF document text
    • https://mufaguzesevulet.weebly.com/uploads/1/3/2/8/132814956/174809.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463824/normal_601b3af66d06e.pdfIn PDF document text
    • https://xinifusat.weebly.com/uploads/1/3/4/3/134321574/xuxuzimakij_zuvipanugidupe_dulexuriv_mutemog.pdfIn PDF document text
    • https://cdn.sqhk.co/katutilit/fF7Xeja/31661413426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450259/normal_60319c9152db5.pdfIn PDF document text
    • https://cdn.sqhk.co/ketusugedi/dLwZji9/duwemogilelapixekuvabex.pdfIn PDF document text
    • https://sabalijazot.weebly.com/uploads/1/3/2/6/132695986/20efbf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sagotomagin/pabaruforoxuvogewalukela.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/bacharelado_em_sistemas_de_informao_utfpr.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/how_to_work_jack_lalanne_power_juicer.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB16 5340 bytes
SHA-256: c62dea9762789b7f6f745a0ac9ef798ada018bf8979952be33d2cf3bda6801b8
font_01_sfnt_off0000fd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD30 10816 bytes
SHA-256: f180cab75f916b62bb0df309a8f45c0447416d63effd7ccc074a005cdff4df55
font_02_sfnt_off00012207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12207 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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