Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bf5fe8cb2b9584…

MALICIOUS

PDF

80.6 KB Created: 2021-03-14 08:35:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ecaf103c9b203aeefa03a6dcc2a5ee0 SHA-1: 127bdcd22a089a28d69fe865fe68220ac413f16a SHA-256: b8bf5fe8cb2b9584c665052ee2014a9b46bfc5d8f211d6513bb5df167c13eb42
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to PDF files, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_LINK_FARM' and the presence of many external URLs indicate a malicious intent to direct users to potentially harmful sites. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or scam purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=bloodborne+dlc+free
    • https://cdn-cms.f-static.net/uploads/4383147/normal_60418313671c2.pdf
    • https://cdn-cms.f-static.net/uploads/4391000/normal_602af6ab65feb.pdf
    • https://cdn.sqhk.co/lilapanorup/kdgjhcL/sound_effects_library_subscription.pdf
    • https://cdn.sqhk.co/zoluxoni/jczijhh/10226153933.pdf
    • https://cdn.sqhk.co/fexiseme/jcibAe2/83453652919.pdf
    • https://cdn.sqhk.co/woledibiroju/ggfJ69K/melavuwumavi.pdf
    • https://cdn.sqhk.co/wolonevavaru/je1jejj/56099137351.pdf
    • https://cdn.sqhk.co/fazologim/idYIWRK/nfl_playoff_picture_2019_week_17.pdf
    • https://static.s123-cdn-static.com/uploads/4444358/normal_5fe5494a98f6f.pdf
    • https://cdn.sqhk.co/minamojazi/SgjjkAL/mx_video_player_apps_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/234b4f55-be53-4b2c-a0da-94a8e152a4d8/14592944379.pdf
    • https://uploads.strikinglycdn.com/files/da627057-abd1-4071-9c6d-7173317d4cb4/25640688728.pdf
    • https://uploads.strikinglycdn.com/files/b5993f09-db1d-4d59-b6a5-c5d682ed940d/99022787701.pdf
    • https://uploads.strikinglycdn.com/files/cf81e15a-9805-4af5-b143-60eca06c5631/tugavupo.pdf
    • https://uploads.strikinglycdn.com/files/d3323ffa-ccee-4364-8957-cf6354a581b5/zorba_the_greek_line_dance_step_sheet.pdf
    • https://uploads.strikinglycdn.com/files/8c1e8cf3-b0a5-4364-8088-08a59bf06fa8/61337618562.pdf
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_2892db2666444372ad925a03ee620235.pdf?index=true
    • https://uploads.strikinglycdn.com/files/eced2a36-f240-47cb-b7e0-f3ad60168158/kusujuwufi.pdf
    • https://uploads.strikinglycdn.com/files/407fe566-479e-452e-b399-09fc391083ea/47223110966.pdf
    • https://uploads.strikinglycdn.com/files/c32ec761-8cfa-44ad-8980-37c46e7986f6/raxapizexodite.pdf
    • https://1639490a-f715-481e-9fb1-af38d332269b.filesusr.com/ugd/a59130_23396e07ce1142ce9acda81459dd5428.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7e4.bin
5849079f66566d2510016cd5ab73d53980ce928a742d39ca12d23be8b6788960		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E4 5840 bytes
font_01_sfnt_off0000fbe1.bin
e581df5d240c503d0a2f52c932158e87b7f56e5073243b16c6f8cd18a928d1a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE1 4816 bytes
font_02_sfnt_off00010c54.bin
7620cae78569e27d22406408e2e198571b6b9cddca64bc70d3831af09531ced0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C54 12076 bytes

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