Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c3b255e52d4c0c…

MALICIOUS

PDF

69.9 KB Created: 2021-01-03 05:23:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4c4f3bcdaa6c681ce9e25d4e2f1d17e2 SHA-1: dc7dbad49d3fc878fab24f3b270044a2c300eec7 SHA-256: b1c3b255e52d4c0c22efb6d35467d418317f162cbd2e898d45309de1a98cda80
244 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm designed to distribute malicious content. The primary malicious URL identified is https://cctraff.ru/123?utm_term=the+devil+saw+me+with+my+head+down+hoodie, which is flagged as a known malicious redirector. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier confidence further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/123?utm_term=the+devil+saw+me+with+my+head+down+hoodie In PDF document text
    • https://pafuwaron.weebly.com/uploads/1/3/4/3/134385690/zikufajoz-nasemej-jomebanawu.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/Nicieie/amazon_prime_video_app_for_smart_tv_apk.pdfIn PDF document text
    • https://busaluvugisegiw.weebly.com/uploads/1/3/4/3/134368440/861ffbe2.pdfIn PDF document text
    • https://josuriwomevopi.weebly.com/uploads/1/3/4/7/134769094/f3e6b35904.pdfIn PDF document text
    • https://buvojitode.weebly.com/uploads/1/3/4/6/134630820/7c31c67268.pdfIn PDF document text
    • https://cdn.sqhk.co/notizejamebo/w6gi4CE/used_home_freeze_dryer_for_sale.pdfIn PDF document text
    • https://kidodekorabatet.weebly.com/uploads/1/3/4/3/134320193/4311180.pdfIn PDF document text
    • https://tanaxigurav.weebly.com/uploads/1/3/4/2/134266775/wuropu.pdfIn PDF document text
    • https://livozowenenebu.weebly.com/uploads/1/3/0/8/130874097/jelamokime-fosoki-wadoxovupubivo-burupidamasuw.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
    • https://uploads.strikinglycdn.com/files/55e93f25-b364-43da-b961-6a2f9e7795ab/human_anatomy_and_physiology_marieb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b53aef40-2835-4bb8-b1ff-9efeac30b685/atec_pitching_machine_replacement_wheels.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59A 4960 bytes
SHA-256: 56e686e9e15570e42e574891f5af0a2fee29b46eb6e7992e8cc7fc5703216704
font_01_sfnt_off0000d671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD671 11108 bytes
SHA-256: 49555284f8ec7a4f2aeac8b575ed21b25ac2f15177c026d7d7406cf014fe45f4
font_02_sfnt_off0000fc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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