Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6bdc3b8c9917f8d…

MALICIOUS

PDF

70.1 KB Created: 2021-02-25 00:22:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 638345111e04e23ec1e37a3e27eb99ad SHA-1: c106d7067510a9c58ed716f2073382034b58706f SHA-256: e6bdc3b8c9917f8d93b29d2493161cdc2bdefe9c788386df24c28fe6f9307d11
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The embedded URLs suggest a potential distribution mechanism for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://seumenha.ru/wb?keyword=bob%20books%20set%201%20book%202 PDF link annotation
    • https://falojaba.weebly.com/uploads/1/3/0/7/130776150/47818271c39.pdfIn PDF document text
    • http://noxesim.iblogger.org/dreams_hollywood_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/sogefuluf/gihhZ3H/22819572258.pdfIn PDF document text
    • https://xizadububexo.weebly.com/uploads/1/3/4/5/134595199/2066384.pdfIn PDF document text
    • https://cdn.sqhk.co/besawevij/hchbxIF/hide_and_seek_game_rules.pdfIn PDF document text
    • http://rijewomel.scienceontheweb.net/renewable_and_efficient_electric_power_systems_solutions_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372378/normal_5ff4ddd6eaf8e.pdfIn PDF document text
    • https://cdn.sqhk.co/bujutinape/eNHlham/56673799487.pdfIn PDF document text
    • http://ripelavezomosiv.iblogger.org/hypothesis_and_prediction_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/tinukomafiro/ctYyoih/98258145667.pdfIn PDF document text
    • https://cdn.sqhk.co/dakagugi/iaow4jf/navigak.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
    • http://jazosorolanik.rf.gd/emulator_for_android_studio_2._3._3.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_off0000c8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F2 4412 bytes
SHA-256: c2a10fbb0e2a92b2e6f0a7ff3708aab857f1188df2a5c4fdcb26e88b744654d3
font_01_sfnt_off0000d7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FD 11040 bytes
SHA-256: 4b202de4af707956fc1a10f2f1b2fb643f842f08f715d13f455bc22327b57c91
font_02_sfnt_off0000fd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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