Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cccc40023d53a2a…

MALICIOUS

PDF

90.4 KB Created: 2021-02-21 18:16:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 3a58c640e77acb03f08c29c938c29689 SHA-1: 44c7aafab307f84e24f71bdcbbeff8e2d817aad9 SHA-256: 9cccc40023d53a2a533c83efef9c15d730338e5e527e4ed72e693a05697db281
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which are disguised as legitimate documents, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically related to phishing. While no scripts were directly extracted, the PDF structure and embedded URIs point towards the exploitation of PDF viewers to redirect users to malicious sites, likely leveraging JavaScript for obfuscation or redirection.

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 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://leonvi.ru/strik?utm_term=ralph+waldo+emerson+essay+the+poet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454575/normal_6015ba1e1ddf3.pdfIn PDF document text
    • http://pearhaidhr.fun/calendar_template_ms_word_2013kryff.pdfIn PDF document text
    • http://realnoe-obshenie.online/illustrated_guide_to_the_national_electrical_code_7th_edition_answer_keysiuw2.pdfIn PDF document text
    • http://sodahq.club/zixatojadezudagiruluwhyv67.pdfIn PDF document text
    • https://gogadumipoti.weebly.com/uploads/1/3/1/0/131070618/2718449.pdfIn PDF document text
    • https://xewezepi.weebly.com/uploads/1/3/0/8/130813550/majajugosidur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403816/normal_5ff556e2d4cf1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465402/normal_5fdd99f4bd041.pdfIn PDF document text
    • https://rapelolizoxofi.weebly.com/uploads/1/3/1/3/131381924/41feccd5dde90c.pdfIn PDF document text
    • https://tibilizam.weebly.com/uploads/1/3/0/7/130775373/8134238.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/bejideba/2642088431.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/lords_mobile_guide_heroes.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/presidential_book_of_secrets_page_47.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/37754633440.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_off00012685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12685 5400 bytes
SHA-256: b1475a961a904859ded81428847e83fb9e7bf139aa2f914c6348521e83bfeac4
font_01_sfnt_off000138cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138CD 10676 bytes
SHA-256: 6c408786bf00f03731ebdf726a4615f0a468f97821a79da803f210fa8bc8e4fe

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