Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4612024f95a1bb…

MALICIOUS

PDF

97.1 KB Created: 2021-03-09 07:50:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68a9119e2266118fc7ddc42143e56766 SHA-1: 1b40990eae82b3f8327bb1a62a618d1bf0c66c69 SHA-256: 6c4612024f95a1bb0951fce22fd858c5d544cd7f6d14fb473c49831430df52f2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO poisoning or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of embedded URLs and the overall structure suggest it's designed to redirect users to malicious sites or download further malware.

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://dafemum.ru/award?keyword=building+construction+illustrated+pdf+free+download
    • http://sberbank.link/wanukesilevojy5tgo.pdf
    • https://cdn-cms.f-static.net/uploads/4478928/normal_602a8a9ac0a38.pdf
    • https://static.s123-cdn-static.com/uploads/4390383/normal_5fc6cee13b4ee.pdf
    • https://cdn.sqhk.co/zozimevoket/jjggNRF/69418316909.pdf
    • https://cdn-cms.f-static.net/uploads/4381094/normal_6024115b4b3dd.pdf
    • https://cdn-cms.f-static.net/uploads/4469136/normal_6029cdd00dfc2.pdf
    • https://cdn-cms.f-static.net/uploads/4404488/normal_60412355c7a88.pdf
    • https://static.s123-cdn-static.com/uploads/4499299/normal_5fe50b10b7bd2.pdf
    • https://static.s123-cdn-static.com/uploads/4501503/normal_5ff91877e6ab1.pdf
    • https://cdn-cms.f-static.net/uploads/4413845/normal_601807bc9b0da.pdf
    • http://table-wait.com/ex_888_casinoc1wox.pdf
    • https://cdn.sqhk.co/sawijoturok/jejdChh/bharat_gas_transfer_application_form.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_3e9405e0951847b19407ece6bd6b1b1d.pdf?index=true
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_5dc6aa68f01e471383d7ea2d89480df4.pdf?index=true
    • https://0efdb04f-128a-4c0d-ace4-8b312723ebcc.filesusr.com/ugd/5508f4_16a92911233a4a77933342873457a649.pdf?index=true
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_34584991aa5947548bd9b20aa20cea04.pdf?index=true
    • https://aca292c6-a3ee-4c96-b4c9-db15c8eca1b9.filesusr.com/ugd/cd1d52_141020eb491c465d82b2c5db33e1227c.pdf?index=true
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_d0c46548f52248cebcf84843579e535d.pdf?index=true
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_4363421aa48941e0886217b84795dc95.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_off00013d33.bin
7de6fb480b3cac2d2abe9789479d9150db082071934e73f9b63cbcda36a0541a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D33 5464 bytes
font_01_sfnt_off00014ff1.bin
a34800fb7bde3cda749b096c95f352a4ab3c778f4a2e22a8b7f8b5a61eeb131c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF1 11484 bytes

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