Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ed53dff79187bf…

MALICIOUS

PDF

80.6 KB Created: 2021-03-07 08:39:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dd19255ceb27a44bec306a2f309db51a SHA-1: ced64958c4aeeedec84914fa43799b7e2b01d0b6 SHA-256: 36ed53dff79187bfea29b43bb6952de36fcb07912a2507cd1ee26cb23f755dc7
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, identified as a link farm and an SEO redirector, pointing to a suspicious domain 'baarspo.ru'. This strongly suggests a phishing or malware distribution attempt, leveraging a 'free download' lure. The ClamAV detection and ML classifier further confirm its malicious nature, likely exploiting a vulnerability to execute a payload.

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://baarspo.ru/123?utm_term=don%2527t+blame+the+eater+main+idea PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402519/normal_6013c7db2e2ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426686/normal_5fed60765667e.pdfIn PDF document text
    • https://kezagoguz.weebly.com/uploads/1/3/4/1/134131769/fixedesujo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403406/normal_603348f4b4fb8.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/imfhj1M/63588752582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481821/normal_60183b60a514b.pdfIn PDF document text
    • https://cdn.sqhk.co/sevijeruba/VPMidib/19873852177.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/iA7gjhb/74436671692.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417206/normal_5fd05403d4a94.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/ipihQhi/88661694427.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365575/normal_6038302343f1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462982/normal_600d051d6a87e.pdfIn PDF document text
    • https://janirakuvofubej.weebly.com/uploads/1/3/4/7/134734148/5635737.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/ehhaZhG/most_played_tiktok_songs_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443802/normal_5ff947f26c951.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489615/normal_5fced38e7e2e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_5fdae30a3b56b.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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 4848 bytes
SHA-256: 0376aba89fc4247efeacceb2eb9db05ecd8ec6ae659492e891fe048d3dfbe260
font_01_sfnt_off000101f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F7 10892 bytes
SHA-256: 8ec65182b52dd3bfea99d5701a26142aaf2a38bd40107f670c5ff79be72ada5c
font_02_sfnt_off00012740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12740 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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