Malicious PDF — malware analysis report

Static analysis result for SHA-256 4358d36fde6c5f81…

MALICIOUS

PDF

70.6 KB Created: 2020-11-19 22:46:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92bde8255b9ee83b33cbe7dcdf0363c7 SHA-1: 1b41adc21b3f7a7507360d5a68dd9d7e7ea5b7d8 SHA-256: 4358d36fde6c5f814232ee50ca3957c13ef73f841f072184a2470517382ea2c4
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a critical heuristic firing for a PDF redirector link pointing to 'https://traffmen.ru/123?utm_term=nuwave+air+fryer+recipes+baked+potatoes', suggesting it's used for phishing or malware distribution. The document body, though heavily obfuscated, appears to contain text related to recipes and application names, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/123?utm_term=nuwave+air+fryer+recipes+baked+potatoes
    • https://cdn-cms.f-static.net/uploads/4367313/normal_5fa4ccb4e729d.pdf
    • https://cdn-cms.f-static.net/uploads/4454988/normal_5fa94397a97c4.pdf
    • https://rufijaduruki.weebly.com/uploads/1/3/4/3/134311805/roworid.pdf
    • https://zugogulubituwo.weebly.com/uploads/1/3/4/2/134266111/2338845.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/039b7869-00cb-4bae-b2fb-41d21a2def73/4102336300.pdf
    • https://uploads.strikinglycdn.com/files/da4261c9-14e5-4b27-a419-a5b1edcf0708/50127805489.pdf
    • https://s3.amazonaws.com/tetenifeme/61888787082.pdf
    • https://s3.amazonaws.com/biwuwukesazef/xolatolavepajusafinitine.pdf
    • https://uploads.strikinglycdn.com/files/a07246d9-fbc0-4c85-8cf0-48c465fefed8/my_downloads_browser.pdf
    • https://s3.amazonaws.com/kizugokofo/molar_mass_of_kclo4.pdf
    • https://s3.amazonaws.com/zuponefi/85099367400.pdf
    • https://uploads.strikinglycdn.com/files/66282376-6cad-4c65-b57f-ab88dc4d4ad7/53848477199.pdf
    • https://s3.amazonaws.com/gowebabuxogiro/75238658745.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_off0000d63f.bin
8281286b3ef4074a7e6631f63cd2a3e2a4fda50e2682e9c0544866171b20b007
pdf-font-stream PDF embedded font (sfnt) at offset 0xD63F 5544 bytes
font_01_sfnt_off0000e94c.bin
9b5ffe2e6471fda4a0fc1580fc633d86054ce9439ceda0a3c337a8fd80ebeb76
pdf-font-stream PDF embedded font (sfnt) at offset 0xE94C 10512 bytes