Malicious PDF — malware analysis report

Static analysis result for SHA-256 5340299a172e5248…

MALICIOUS

PDF

80.6 KB Created: 2021-05-12 07:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca12b863f6c159b2048a74ae0087c322 SHA-1: b0f3b2b88a8e1e0bed8948a49c90af9ec16989b5 SHA-256: 5340299a172e524836d51d01652dfa97755e2d56a6609e3764de4aa708d6f342
156 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 of which point to suspicious domains and are likely part of a link farm designed to host malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of the file. While no scripts were directly extracted, the structure and heuristics point towards a phishing or content-luring attack pattern.

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://zajinet.ru/strik?utm_term=international+dt466+truck+for+sale
    • http://demask.space/fikofuk1if8.pdf
    • https://cdn-cms.f-static.net/uploads/4465263/normal_606ea1955df7f.pdf
    • http://canlisohbetim.net/wegotutebivabusqw1mg.pdf
    • https://cdn.sqhk.co/tawavumazo/OQgg2kX/phoenix_gas_prices_philippines_today.pdf
    • http://ujjjrrrrr.space/869862647040hjlh.pdf
    • http://reabook.online/2010_volkswagen_jetta_transmission_fluid_typekg7h6.pdf
    • https://cdn-cms.f-static.net/uploads/4459916/normal_60367419afe6a.pdf
    • https://cdn.sqhk.co/foropogajag/3jfhjeB/85060410496.pdf
    • https://cdn.sqhk.co/sosobigawe/ievpshf/89904460224.pdf
    • https://cdn.sqhk.co/dutebevon/fibjjij/62011702386.pdf
    • https://cdn.sqhk.co/togareguko/ECejfig/amiduos_crack_64_bit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_19e91c2423ab454a9fcac32ddda0c18c.pdf?index=true
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_394dfac1334f4f66b393177a89df8da6.pdf?index=true
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_ed127723997d4df9846f3dee2a7c1651.pdf?index=true
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_b5ee76b405384c4988763818a4d7fdaa.pdf?index=true
    • https://1ba6f066-89d4-4445-b8a9-08a6de046ef2.filesusr.com/ugd/d40554_980705a010784e8fa763e73a2a9f53b7.pdf?index=true
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_a7c0f8b728654e02bf0341525cfc4445.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef72.bin
b0a858e379d7c3f3a5c86abcdb64fd520e9d13e22416300b0c1eb445ed85875c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF72 5140 bytes
font_01_sfnt_off000100f9.bin
0c7ec03f643c624eca024f4bf13fb4f848b7dfd1fd692dceec0cdf923c3c08ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100F9 11180 bytes
font_02_sfnt_off00012713.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12713 4324 bytes

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