Malicious PDF — malware analysis report

Static analysis result for SHA-256 2143a128a5560375…

MALICIOUS

PDF

69.0 KB Created: 2020-11-18 09:35:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0699abd2ec05f8ff8243dea5da3aca97 SHA-1: d07441d4ca992d22ab9192bdb1510b8d0ebb387b SHA-256: 2143a128a5560375b691e1cc46626902617feea2a2294fd28339cfa1798cc4e2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with a critical heuristic flagging it as a 'PDF_SEO_LINK_FARM', suggesting it's part of a network to manipulate search engine results or redirect users to malicious sites. The embedded URLs point to potentially harmful domains, and the document body, though heavily obfuscated, contains references to technical terms which may serve as a lure.

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://traffnew.ru/strik?utm_term=2n3055+transistor+amplifier+circuit
    • https://mubuwejazanewa.weebly.com/uploads/1/3/4/5/134585617/8b6d131959dded4.pdf
    • https://cdn-cms.f-static.net/uploads/4371025/normal_5f8a039f7e50d.pdf
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/xojajuv-mitegejitokuxig.pdf
    • https://cdn-cms.f-static.net/uploads/4368249/normal_5f8ea8a723e6d.pdf
    • https://cdn-cms.f-static.net/uploads/4392463/normal_5f945b00c9ce3.pdf
    • https://cdn-cms.f-static.net/uploads/4470964/normal_5fa9c52f36e07.pdf
    • https://cdn-cms.f-static.net/uploads/4369671/normal_5f94140c26500.pdf
    • https://cdn-cms.f-static.net/uploads/4374376/normal_5f8d133bac229.pdf
    • https://cdn-cms.f-static.net/uploads/4368477/normal_5f8f5901a0443.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4a04e285-a355-4f63-99b4-30ffe4203d50/pojitawasuputitarimujob.pdf
    • https://uploads.strikinglycdn.com/files/ca487a6e-52a0-4d14-91f3-3fc69e9b35ee/65612959438.pdf
    • https://uploads.strikinglycdn.com/files/94a35721-192d-44d0-8e7b-7a58f1bef975/mitakuxux.pdf
    • https://uploads.strikinglycdn.com/files/8142143b-effc-4a10-a01e-64bc8ab4582d/lepara.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce84.bin
01307eafc3a840c4442693b3c6f3ef8d0b5110128399d31d78d20297a7a68330
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE84 5628 bytes
font_01_sfnt_off0000e195.bin
2f233872ca649de43a10af211af12dfdff861650dbb32e08813670078a4e881c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE195 11028 bytes