Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc74e8cdec8c2b36…

MALICIOUS

PDF

73.7 KB Created: 2021-01-23 07:52:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c6dcbeb536c19b3bb2ebea53539f65a SHA-1: b9d7831d95953ad60dd000b41c9ce6315d954de4 SHA-256: bc74e8cdec8c2b36c59bc51f2a8d9063e26fde6cc988b20a361305d09168cc8a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to SEO-optimized PDF documents, indicating a link farm or spamming operation. ClamAV and an ML classifier identified this file as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/123?utm_term=the+four+agreements+quotes+printable
    • https://static.s123-cdn-static.com/uploads/4377414/normal_5ff679892d0f0.pdf
    • https://putonikasobex.weebly.com/uploads/1/3/1/0/131070178/kakafefax-vonomirepanit-xolonipudak-wusovogoza.pdf
    • https://gidunixodon.weebly.com/uploads/1/3/5/3/135322071/2437231.pdf
    • https://site-1180586.mozfiles.com/files/1180586/ice_cream_roll_maker_cheap.pdf
    • https://dugubutufafug.weebly.com/uploads/1/3/0/7/130775350/6618239.pdf
    • https://site-1168050.mozfiles.com/files/1168050/minecraft_pe_survival_games_server_lifeboat.pdf
    • https://tiwofimobodes.weebly.com/uploads/1/3/4/0/134040820/5555601.pdf
    • https://site-1180908.mozfiles.com/files/1180908/trophy_tracker_clash_royale.pdf
    • https://vesanawe.weebly.com/uploads/1/3/4/6/134602832/4377820.pdf
    • https://losebevaxefot.weebly.com/uploads/1/3/5/3/135347065/5126de419.pdf
    • https://gimitowogavu.weebly.com/uploads/1/3/4/7/134746983/5b76acd.pdf
    • https://cdn-cms.f-static.net/uploads/4451940/normal_5fd7fa0e19b03.pdf
    • https://site-1179337.mozfiles.com/files/1179337/att_device_unlock_portal_down.pdf
    • https://site-1173152.mozfiles.com/files/1173152/43210013592.pdf
    • https://kufavugozit.weebly.com/uploads/1/3/5/3/135309998/43b0fcc0d77.pdf
    • https://site-1166610.mozfiles.com/files/1166610/56594854745.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/povodijirig/basics_of_perspective_drawing.pdf
    • https://s3.amazonaws.com/wewuxuviwar/10865335207.pdf
    • https://s3.amazonaws.com/bibejovixapis/29289764605.pdf
    • https://s3.amazonaws.com/sedimeraxufi/jipiruwoz.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_off0000e411.bin
bf7ee91f02210243c3cacc173ac0785b689cdc0bf48e61cb02da0290b0b1facb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE411 5528 bytes
font_01_sfnt_off0000f6b0.bin
7b4362ae77644dfdd40721ae020cc5c277cfa21084f2bc44227aaef18715275f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B0 10256 bytes

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