Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ec405bc31f26aa…

MALICIOUS

PDF

84.2 KB Created: 2021-01-20 14:51:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 47a7bded9f1f33825fd1bed7d28f7423 SHA-1: bd667007253b9491e35e0fd62355d6bb13f9db06 SHA-256: b6ec405bc31f26aa1f4e0340053f9699b784f6fb75151d180f28aa4948f7a308
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with at least one identified as a malicious redirector. The heuristic firings indicate a link farm designed to redirect users to potentially harmful content. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to direct users to malicious infrastructure, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://gettraff.ru/123?utm_term=skyrim+legendary+edition+guide In PDF document text
    • https://kibanelamuvudu.weebly.com/uploads/1/3/0/9/130969844/fugozatijano.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501656/normal_5fc7f8904a7e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446287/normal_5fe7b67106558.pdfIn PDF document text
    • https://cdn.sqhk.co/kipasewimoni/XBFiczG/game_dev_tycoon_ios_guide_sliders.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503197/normal_5fdc08f5a8a6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478947/normal_5fabcad76d5c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485718/normal_600134f533285.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/pxHhbhh/dope_wallpapers_2020_hd_dark_wallpapers_1080p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410731/normal_5fa84bdd599bb.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/cpKgcji/red_heart_mobile_wallpaper_hd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377377/normal_5fd2dee64dc77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368751/normal_5ff936347d235.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/bolovopizonuki/marine_net_corporals_course_communications_answers.pdfIn PDF document text
    • http://nifukugobu.rf.gd/73393924594.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_off00010d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5E 5236 bytes
SHA-256: 180e284df51aeb8f3382a5d07441eaf68a05725465b96f6badd2126a56927dcc
font_01_sfnt_off00011f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F21 10904 bytes
SHA-256: 88b9e921c2e5d353b8bee6b6870b008dd65040682061c9f953e4d34d18ecba91

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