Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9ee10f5c939538…

MALICIOUS

PDF

77.6 KB Created: 2021-03-27 09:55:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aece6bf0e19fec76a90a39881a795700 SHA-1: 7290893836066bb52397341e78e1a55d2e5c1f9e SHA-256: ef9ee10f5c939538f1c73fdf0187962a6843f5dccf6b0a44b9ad5f71261b8b85
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/123?utm_term=sao+l%25C6%25B0u+%25E1%25BA%25A3nh+t%25E1%25BB%25AB+icloud+sang+android
    • http://laulu-go.ru/joyetech_evic_vtc_dual_coilmpepr.pdf
    • https://veduwasa.weebly.com/uploads/1/3/1/6/131637496/jadunodo.pdf
    • http://copyright-securityx.com/fisewoperowijulewovr2oxo.pdf
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/kiratav_lojigoxip_kamowudo.pdf
    • https://lutitisuputusi.weebly.com/uploads/1/3/1/4/131437948/706fe6c7e8c6382.pdf
    • https://volufijipezuji.weebly.com/uploads/1/3/4/7/134703795/mamufogadanoxi-zepaxedubi-zatelapafu.pdf
    • https://cdn-cms.f-static.net/uploads/4463560/normal_603e6d1cbbd6a.pdf
    • https://feravenokitaj.weebly.com/uploads/1/3/6/0/136095553/4348465.pdf
    • https://xukanimuwuvam.weebly.com/uploads/1/3/2/6/132696198/809e8c42b8a5d7d.pdf
    • https://cdn-cms.f-static.net/uploads/4446379/normal_604b6fd4c81c8.pdf
    • http://natnat.fun/download_livro_historia_do_brasilpzwyp.pdf
    • https://werevofapopaja.weebly.com/uploads/1/3/4/4/134492388/3030700.pdf
    • http://taygerr.com/34499210857s9arf.pdf
    • https://pasazobunev.weebly.com/uploads/1/3/4/6/134670772/6f3458a5f.pdf
    • http://orehi-siberian-force.online/8276650349dev7m.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7043ee2c-bc2d-4d46-b82c-b0075177c1aa.filesusr.com/ugd/f862b5_5a200b50b1724f06a70e80ad8fc83b86.pdf?index=true
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_b3cc89c2aa19440eb395a76d102ddeee.pdf?index=true
    • https://e5720c39-3c1c-4a52-9be9-509675281b5a.filesusr.com/ugd/0010c8_6b143c1944cc4acd88b87e1c95a616d8.pdf?index=true
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_06071f3f250b4bc5800db02bae79bad0.pdf?index=true
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_deb4bb3b9911430fb416f36c34b4fc9a.pdf?index=true
    • 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_off0000e502.bin
21f73a0cc139a8a30ceced16ecb91e7b0ce3bb11f8dd70e0075aa99d5f2894bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE502 5864 bytes
font_01_sfnt_off0000f7e3.bin
34a7806647aa70751c75fea66796e531b978c8326c5a1dd13ab9fda3d1cfc098		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E3 20780 bytes

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