Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fce96cfd3d9c6db…

MALICIOUS

PDF

85.8 KB Created: 2021-03-20 16:41:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: dde83e5440c080c4dfbed971f0983541 SHA-1: c9d3edb380bdc15d2b800393cb49809abf980446 SHA-256: 3fce96cfd3d9c6db9bac7678ef9167fee39fa5fe789d5896578d7f9c6b18b2b1
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to disposable hosting, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=elements+of+communication+environment PDF link annotation
    • http://wazadewiketepa.22web.org/92056645090.pdfIn PDF document text
    • http://tadinos.22web.org/how_to_remove_door_rubber_on_lg_washing_machine.pdfIn PDF document text
    • http://checkyourcredit.info/toeic_test_reading_part_6w7uqs.pdfIn PDF document text
    • http://trafikcezaodebayisi.com/alex_rider_season_2_episode_1nvuo3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_64cf997e79034dca89d0c040df413cab.pdf?index=trueIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_16a4cc29c41b40908e27b8e127b705f8.pdf?index=trueIn PDF document text
    • https://f1e11ea9-a931-46ad-af30-391325c877dd.filesusr.com/ugd/423518_cc873df9f98645f4a203f20f782ef831.pdf?index=trueIn PDF document text
    • http://ziwutaje.epizy.com/2005_bmw_x5_phone_manual.pdfIn PDF document text
    • http://nilevividik.rf.gd/gusenosujegodufosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ea9b010-09d8-45c7-b32b-393078e735e4/apc_smart_ups_2200xl_specs.pdfIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_034fe350041940ff9b07f2239ac5742e.pdf?index=trueIn PDF document text
    • https://c2963e02-5f2a-49ff-bb4d-22715b80ab3a.filesusr.com/ugd/55efe4_491d27edbb6a48fc967b6574d312a937.pdf?index=trueIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_8ac9cd2b4b24466eb017111e06370227.pdf?index=trueIn PDF document text
    • http://nixevafuzija.epizy.com/xixosin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31a32d3c-8312-4944-b78a-62cfc3281436/57100700019.pdfIn PDF document text
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_43392dfaabff402aa20c6e39b8d613ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/939824b3-d68c-450e-bf9c-4200e7a1d7b6/devadokenifaxibewuj.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_off0001106d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106D 5044 bytes
SHA-256: 9b19597cbeb651d6fb789968ed63ff3853473d767c1d7ec373b2c8e44ca00cb1
font_01_sfnt_off0001218b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218B 11368 bytes
SHA-256: f20e32dca442d0d311f095fa74496e45ae5ba92be40fdfe4fcd9b56f32ff3c51

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