Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c8fa3e9eeaaf95…

MALICIOUS

PDF

81.0 KB Created: 2021-06-13 17:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0779c834599bb08b5db1114e9b28527 SHA-1: dde158e24f2feb5aa591870957a0511d17016cc3 SHA-256: c3c8fa3e9eeaaf95ac7f7e44e72a1dd2037dc26cb4be98b3b44aee09b8bf20c3
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded content, though heavily obfuscated, appears to be related to SEO and link manipulation, likely to drive traffic to malicious or scam websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://queure.ru/pbw?utm_term=pathfinder+core+rulebook+pdf+free
    • https://xozanazefozi.weebly.com/uploads/1/3/0/8/130874019/9269984.pdf
    • https://jafovoguna.weebly.com/uploads/1/3/4/0/134096268/3318756.pdf
    • https://femomupine.weebly.com/uploads/1/3/4/4/134458898/22d04237.pdf
    • https://xegavepixax.weebly.com/uploads/1/3/1/4/131452872/7263d783fe481.pdf
    • https://libuxave.weebly.com/uploads/1/3/4/4/134438459/7612912.pdf
    • https://wupifikuzokure.weebly.com/uploads/1/3/4/5/134529023/3895999.pdf
    • https://widonudafedezu.weebly.com/uploads/1/3/0/7/130776490/sefududagetiboji.pdf
    • https://zagajubigifebig.weebly.com/uploads/1/3/4/7/134773219/famukop.pdf
    • https://loxojugeg.weebly.com/uploads/1/3/4/5/134589710/jodorekulirafe-farenimuv-rawonopotu.pdf
    • https://vefubonipit.weebly.com/uploads/1/3/4/7/134719522/pevarijuxerul_ripidibedekal.pdf
    • https://xudowiwigikit.weebly.com/uploads/1/3/4/4/134462868/4a4be.pdf
    • https://zitavumerut.weebly.com/uploads/1/3/4/4/134465292/ff4d33973.pdf
    • https://mopabofigovusig.weebly.com/uploads/1/3/5/3/135319119/kawidokomiten.pdf
    • https://bolojowugupi.weebly.com/uploads/1/3/4/8/134886087/zojob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://negovijalulu.pbworks.com/f/how_to_write_bank_request_letter.pdf
    • https://uploads.strikinglycdn.com/files/96b295ba-660d-4883-84fd-1fa17fc3d6d4/57588907648.pdf
    • http://maxasol.pbworks.com/w/file/fetch/144548082/6531486024.pdf
    • http://letonepamusi.pbworks.com/f/zemekuwonuz.pdf
    • https://uploads.strikinglycdn.com/files/0a74d2f5-f342-4cfd-be13-9c70f12db877/bancomer_san_jose_iturbide.pdf
    • http://vikiruji.pbworks.com/f/nordyne_furnace_troubleshooting_codes.pdf
    • http://xawasesofe.pbworks.com/w/file/fetch/145172643/mekofesiruwerad.pdf
    • http://xovelezid.pbworks.com/w/file/fetch/145105128/think_and_grow_rich_summary_ppt.pdf
    • https://uploads.strikinglycdn.com/files/f2bfe050-f432-45b6-a559-953398a9622e/lotujejogawovogibanugoju.pdf
    • https://uploads.strikinglycdn.com/files/86faccb4-e0a3-4b42-b783-7ccedb39de75/92784855175.pdf
    • http://moxulolo.pbworks.com/w/file/fetch/144441198/sample_recommendation_letter_for_high_school_student_from_guidance_counselor.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_off0000febb.bin
da9f91d9a436e99364e964713fa8b1d1683e7c124fc217b4c60e992faae286ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBB 5272 bytes
font_01_sfnt_off0001109e.bin
4f5973d3cf66b4bc71a9c3555904881a232094e7c1c0cd588ce3583574249275
pdf-font-stream PDF embedded font (sfnt) at offset 0x1109E 11032 bytes