Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb96a306fd87392…

MALICIOUS

PDF

68.1 KB Created: 2021-01-04 20:23:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81028248a4438b425c73978c7c10e539 SHA-1: d65206f81aabab6face0f8e7486b7eb73a6b720a SHA-256: 1fb96a306fd87392687c7f205628ad08bfa5a07e16bb203374d509ea6949f2ad
254 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure and a link farm, indicating a phishing or malware distribution attempt. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document's content is designed to trick the user into installing something, which is a common social engineering tactic. The ML classifier and ClamAV detection further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://ggtraff.ru/aws?utm_term=video+tr%25C3%25AAn+facebook+b%25E1%25BA%25B1ng+idm
    • https://wulapoledonuker.weebly.com/uploads/1/3/2/6/132695240/larewinokal_nujexuk_nezasafego_voworebusuturaw.pdf
    • https://lamuwibosuzo.weebly.com/uploads/1/3/1/0/131071033/a5d93.pdf
    • https://wirukibit.weebly.com/uploads/1/3/0/9/130969322/9323230.pdf
    • https://wuduzavuvavazi.weebly.com/uploads/1/3/4/6/134618101/galirezaxi-netobab-vunatovuredix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rojalexipokadaz/38228763108.pdf
    • https://s3.amazonaws.com/zirojopemup/90345108299.pdf
    • https://s3.amazonaws.com/subud/jixezetuzazejije.pdf
    • https://s3.amazonaws.com/waxapoz/best_android_tower_defense_reddit_2019.pdf
    • https://uploads.strikinglycdn.com/files/2f098c6f-a1a5-44d6-821c-c63ee5b98871/determine_the_equations_of_the_shear_and_bending_moment_curves.pdf
    • https://s3.amazonaws.com/pokorevalaxex/votet.pdf
    • https://uploads.strikinglycdn.com/files/1cc754a8-0ee2-4984-90c5-c344d7d746f5/no_place_to_have_sex.pdf
    • https://uploads.strikinglycdn.com/files/f46c9e2c-67e8-458c-9789-a58b4ff975f8/54959955917.pdf
    • https://uploads.strikinglycdn.com/files/5ad10b2c-1036-4e01-beca-ce855bbb9dc6/dnd_revenant_blade_feat.pdf
    • https://uploads.strikinglycdn.com/files/8c89c124-3333-4c65-b6ae-57f34b9fb10e/27188317521.pdf
    • https://s3.amazonaws.com/pozokimepe/baahubali_2_theme_music_in_isaimini.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbc4.bin
9a4fc4698fedf30ae1ef07584c4632eabf54369317dd93fda3eb1d1eeb12129d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC4 5736 bytes
font_01_sfnt_off0000de69.bin
96006b2bbfa0d832003493829b9178f09421ab15b76abbd19e68460d2ee2806e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE69 10488 bytes

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