Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff30fe626a5bfea8…

MALICIOUS

PDF

78.8 KB Created: 2021-05-26 08:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f483e65d275eb65c2238c1a8ede14ca SHA-1: 6fc2a127b2d70419240a457959615b3e1ee60866 SHA-256: ff30fe626a5bfea813620f6dad90a92fd7954afb465e3e4787b340aed13ec098
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'resalured.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, contains keywords related to the URL, suggesting a lure to trick users into visiting the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://resalured.ru/strik?utm_term=weight+training+for+beginners+male+at+home
    • https://cdn-cms.f-static.net/uploads/4369630/normal_604d91dc871b5.pdf
    • https://cdn-cms.f-static.net/uploads/4482424/normal_5fd91aae4a926.pdf
    • https://cdn-cms.f-static.net/uploads/4495395/normal_602167cd2caa9.pdf
    • https://static.s123-cdn-static.com/uploads/4382965/normal_5fcbde2c78a6d.pdf
    • https://static.s123-cdn-static.com/uploads/4372101/normal_5ff65dade4d73.pdf
    • https://cdn-cms.f-static.net/uploads/4459470/normal_604678168b288.pdf
    • https://static.s123-cdn-static.com/uploads/4366040/normal_5ff105f9aecc6.pdf
    • https://cdn-cms.f-static.net/uploads/4499300/normal_6058d787f2fb0.pdf
    • https://cdn-cms.f-static.net/uploads/4421217/normal_6069d427cce18.pdf
    • https://cdn-cms.f-static.net/uploads/4380230/normal_60570a1f548a1.pdf
    • https://static.s123-cdn-static.com/uploads/4378379/normal_60089839b75a2.pdf
    • https://cdn-cms.f-static.net/uploads/4454691/normal_603f7de9192c1.pdf
    • https://cdn-cms.f-static.net/uploads/4376098/normal_5fd18560b7fdb.pdf
    • https://cdn-cms.f-static.net/uploads/4477886/normal_5fd96c2777730.pdf
    • https://cdn-cms.f-static.net/uploads/4445101/normal_602592486dc55.pdf
    • https://cdn-cms.f-static.net/uploads/4428331/normal_602d3ebeec277.pdf
    • https://static.s123-cdn-static.com/uploads/4445889/normal_5fca097f56a28.pdf
    • https://cdn-cms.f-static.net/uploads/4369659/normal_606a3ef3781c5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c6df70fc-9af9-4e5e-8880-d9e4302df9ff/52643242763.pdf
    • https://uploads.strikinglycdn.com/files/8531e573-92f9-48b1-b629-a0d3189eb3d8/14394837394.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_off0000f92d.bin
69cfc804e2ec853f2c57253f12ba7ca0faaf8d25e68ada5e98afe90e8f600ec6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 5332 bytes
font_01_sfnt_off00010b34.bin
745c774245c35ae1f84d21ad362b8f95c2c741f7707f22aed72b48f9d6491b95
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B34 10148 bytes