Malicious PDF — malware analysis report

Static analysis result for SHA-256 69685b0c613cc54a…

MALICIOUS

PDF

84.6 KB Created: 2021-05-23 04:41:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0f7a32647f7530815b1d62c6d099c9f1 SHA-1: 7eb42dbc3f5d8b182b29890ccb37e19ad80cd3d0 SHA-256: 69685b0c613cc54add76580fe57de514f277e1aa845d9b1e970e7b83da8795ac
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many of which are designed to appear as download links for movies, a common phishing lure. The primary malicious URL identified is a redirector that appears to be part of an SEO link farm, suggesting an attempt to drive traffic to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jacksth.ru/strik?utm_term=tum+bin+2+full+movie+hd+720p+download+123mkv PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370307/normal_6053248ec8509.pdfIn PDF document text
    • https://galesarenad.weebly.com/uploads/1/3/4/3/134380117/rozuwilerivikapunu.pdfIn PDF document text
    • https://xawizavikerid.weebly.com/uploads/1/3/4/5/134525990/modelobiresak-gopejoja.pdfIn PDF document text
    • https://saboruxeketeg.weebly.com/uploads/1/3/4/8/134850947/xalomezaparox_vapoziporav.pdfIn PDF document text
    • https://zinegekoxemajaj.weebly.com/uploads/1/3/4/7/134767253/viwilid_mibosovun_tatetadedane.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483854/normal_6005eba829b29.pdfIn PDF document text
    • https://somanenor.weebly.com/uploads/1/3/4/4/134472611/maxugaji.pdfIn PDF document text
    • https://pareniwidof.weebly.com/uploads/1/3/5/3/135313819/cd06f8e3edf0a30.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/jobavo/aneurysm_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/13331503433.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/46003375650.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/repikivupolurusumesutav.pdfIn PDF document text
    • https://s3.amazonaws.com/lazesej/gefixasopuvam.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/bekabifelunelotijakubowi.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/logo_quiz_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/gujosimanog.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/gutanem.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/family_life_merit_badge_workbook_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/presto_16_quart_pressure_canner_instructions.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_off00010690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10690 5884 bytes
SHA-256: 31cdd7d415505cea8f554bffd4a8b591f12b3558d151e33e0ba18ef7efd8d0ba
font_01_sfnt_off00011a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A97 12652 bytes
SHA-256: c5f5357bf1cda2ddc741bdb379e14cc58b2ab5ee764e226ed96cdcc4dfbf069a

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