Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe80e7a573b2a88…

MALICIOUS

PDF

79.5 KB Created: 2021-03-20 18:29:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39866230f8dbd1f202117f9728d47599 SHA-1: 203f4cf24622af00a9ad303be4a590eca0a69e68 SHA-256: 7fe80e7a573b2a883be0dba0f39bfc576cdbda862c273265d01664bd6e42b780
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://seumenha.ru/strik. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links indicate a malicious intent, likely to redirect users to harmful content or initiate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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/strik?utm_term=wine+enthusiast+wine+cooler+not+working
    • https://cdn-cms.f-static.net/uploads/4484623/normal_600d85504519f.pdf
    • https://nasaxedinevizuv.weebly.com/uploads/1/3/4/7/134759800/09b7119fe72258f.pdf
    • https://wemizufatevovig.weebly.com/uploads/1/3/4/8/134896488/bomesow.pdf
    • https://logifuvixejexa.weebly.com/uploads/1/3/6/0/136019385/2450c.pdf
    • https://pakunifa.weebly.com/uploads/1/3/5/3/135307874/nokuwevogoxu_butomuxa_kesonabanuzidi_gapilagu.pdf
    • https://puluzoxaxidu.weebly.com/uploads/1/3/2/6/132683087/9417328.pdf
    • https://cdn-cms.f-static.net/uploads/4450151/normal_6013c19821fa7.pdf
    • https://merirano.weebly.com/uploads/1/3/2/7/132710628/nuturor_vunudazetetaki_viwunodotew_xafule.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/widuxade/dunkin_donuts_signature_latte_pumpkin.pdf
    • https://s3.amazonaws.com/jenisozazewubo/issue_log_sheet.pdf
    • https://uploads.strikinglycdn.com/files/25861b73-65b9-4a1e-85d7-8cb0633a7b49/how_to_install_plugy_diablo_2_1.14d.pdf
    • https://uploads.strikinglycdn.com/files/fc590edf-0fd4-4a3a-aa2c-97e001ec559a/xovinur.pdf
    • https://uploads.strikinglycdn.com/files/191e35d2-ce0a-4f7c-a6e7-f7378c7bd80f/how_to_start_a_business_books_to_read.pdf
    • https://s3.amazonaws.com/bibejovixapis/how_to_write_about_animals.pdf
    • https://s3.amazonaws.com/pasawe/sofosowefukojugapones.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb7e.bin
5f610cc9152fda27e0637695fe76de775d197814fab2ab9e9a872380b9f99cc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7E 5112 bytes
font_01_sfnt_off0000fcec.bin
a0dfd23bf325ecf67fa5fb7f34f4e210368c214637ddf5b1ffd07c2ba46be983		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEC 11116 bytes
font_02_sfnt_off000122d9.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122D9 4324 bytes

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