Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1c07b669c485bf…

MALICIOUS

PDF

75.8 KB Created: 2021-02-28 00:13:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: fb98d44dc5cef2c6ab76be23d4764bda SHA-1: 7111f60e4bd810e011a54dd647a37fc797364094 SHA-256: ca1c07b669c485bfc0095ea2f78eccb7d161a7a96d6ed5ab3b03c792fe553a29
194 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The presence of a "download" lure and the ML classifier's high confidence score indicate a malicious intent to lead users to potentially harmful content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=merchant+of+venice+full+movie+download PDF link annotation
    • http://repair-foto.ru/sadlier_vocabulary_workshop_level_e_answers_unit_1_completing_the_sentenceqdvyl.pdfIn PDF document text
    • https://xebololu.weebly.com/uploads/1/3/4/3/134340913/nekusizenali.pdfIn PDF document text
    • http://rp-youtube.fun/6260187096jhcc2.pdfIn PDF document text
    • https://lovizedisar.weebly.com/uploads/1/3/1/4/131437361/e4bf691e.pdfIn PDF document text
    • http://dizurexemubegog.mygamesonline.org/sojenititava.pdfIn PDF document text
    • https://vojituletakez.weebly.com/uploads/1/3/0/8/130874409/febiwef.pdfIn PDF document text
    • https://vapovudinawixe.weebly.com/uploads/1/3/1/4/131437980/rafivafido.pdfIn PDF document text
    • https://nokidevekixim.weebly.com/uploads/1/3/2/3/132302759/nesuparuwagef.pdfIn PDF document text
    • http://helpcenter.business/harambe_in_heaven_meme_templateasf8c.pdfIn PDF document text
    • http://mysteps.online/acura_rsx_owners_manualmtrm0.pdfIn PDF document text
    • http://fruktovik.com/norstar_phone_feature_codes099oj.pdfIn PDF document text
    • http://tradebot.space/tropico_6_downloadmevw8.pdfIn PDF document text
    • http://avtoshtorki.shop/allwinner_a134o83f.pdfIn PDF document text
    • https://bezebaterizijir.weebly.com/uploads/1/3/1/3/131384714/jisozu-rekadaxirase-genubotujokar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE977 5240 bytes
SHA-256: 37b44915af49307e7669cc6dde9504bb5b5d89bb0994402d50d4929ff91b9da5
font_01_sfnt_off0000fb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB43 11932 bytes
SHA-256: 9fe6b95048efac25545c6c43823bd2691169616df9e7a8f8a4c1f41a630d252b

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