Malicious PDF — malware analysis report

Static analysis result for SHA-256 f825535827464ce3…

MALICIOUS

PDF

85.2 KB Created: 2020-11-28 18:55:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbca2890abb52ec5e5b086a857c81a69 SHA-1: 719ab03d90b70f773dbe2becb4999710c678a2dd SHA-256: f825535827464ce3be71702710103351c862cf852136050f6c2ec001fe47681f
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with at least one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to distribute traffic or host malicious content. The ML classifier and ClamAV detection further support the malicious nature of this PDF, likely used as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/strik?utm_term=kenneth+frampton+modern+architecture
    • https://cdn-cms.f-static.net/uploads/4476002/normal_5fa9db6e2e48b.pdf
    • https://zokejiwiperasuk.weebly.com/uploads/1/3/4/6/134668939/kobaworer_guputu_ginekudogujekob_borakowupojexoz.pdf
    • https://cdn-cms.f-static.net/uploads/4402250/normal_5fc11f6db9341.pdf
    • https://xuvakaxatal.weebly.com/uploads/1/3/1/0/131070170/9870613.pdf
    • https://zutijuxugovoxi.weebly.com/uploads/1/3/4/6/134684331/lolas_daxewurufavi_xerolel_kirubitufebixew.pdf
    • https://cdn-cms.f-static.net/uploads/4374953/normal_5fa68fa7a37c1.pdf
    • https://relugudikovok.weebly.com/uploads/1/3/4/2/134265752/4e0266d2.pdf
    • https://bowulotufevep.weebly.com/uploads/1/3/4/5/134595608/lewebawot.pdf
    • https://cdn-cms.f-static.net/uploads/4408713/normal_5fa8753d2e6ba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mesotodimus/45902872022.pdf
    • https://uploads.strikinglycdn.com/files/8e09d7b4-baf6-4eca-95a9-96e48cc07836/89011179372.pdf
    • https://uploads.strikinglycdn.com/files/40b273fc-954e-4b92-a9c0-612ba96bc4a6/10610145784.pdf
    • https://s3.amazonaws.com/wuxibipan/download_avengers_endgame_4k.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001190e.bin
744b851eed30550734f39ad189a0c7b3162792967ef9d5ce1134933e51ff80ca		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1190E 25808 bytes
font_00_sfnt_off0000e0e4.bin
572f2f8946d627ed95f19a1ef00764f1db20e527bb5bcdd066ffa1d8a90e69d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E4 5156 bytes
font_01_sfnt_off0000f249.bin
411b80b1406ddac3ace614aa983b7a664920ed6274d1f783585a6aa14dc2f925		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 11844 bytes

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