Malicious PDF — malware analysis report

Static analysis result for SHA-256 8319aa572b7dd4bd…

MALICIOUS

PDF

73.4 KB Created: 2020-12-24 19:48:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2d1f292c588f945a212e9aacbfdebcd SHA-1: 72beaebc2accd8d1e5d8518e198429d2af49ae0d SHA-256: 8319aa572b7dd4bd7fc527c5e474bbca160bae1c784c0cabc20a64d599d9e4ac
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 identified as a phishing trojan. It contains an embedded URI pointing to 'https://trafficel.ru/aws?utm_term=android++file+with++manager', which is likely the primary lure. The document body, though heavily obfuscated, suggests a theme related to 'Android file with manager', potentially a pretext for the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/aws?utm_term=android++file+with++manager
    • https://cdn-cms.f-static.net/uploads/4477156/normal_5fdbd1781e92d.pdf
    • https://cdn.sqhk.co/guzunilepin/jjwa7LA/39477260417.pdf
    • https://cdn-cms.f-static.net/uploads/4416665/normal_5fb292d01dad5.pdf
    • https://cdn-cms.f-static.net/uploads/4366989/normal_5fd331567b0ea.pdf
    • https://cdn.sqhk.co/fofasafiwi/ahbzja3/windows_10_offline_sync_folder_location.pdf
    • https://cdn.sqhk.co/palubavuz/4Mhajhh/mipidikenagilakakulu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6304f9b7-891e-4d85-a3a0-e06b981efe78/19613418508.pdf
    • https://uploads.strikinglycdn.com/files/24549430-1e50-4ed8-8a09-4c4a7ecbdd61/igenetics_a_molecular_approach_3rd_e.pdf
    • https://uploads.strikinglycdn.com/files/cb7e3529-3826-4dad-b7df-8cf75b5559de/my_little_army_designer.pdf
    • https://uploads.strikinglycdn.com/files/880b7e2e-ccff-4efd-87f2-4df3bf149c0c/uc30_mini_led_projector_manual.pdf
    • https://uploads.strikinglycdn.com/files/d099d75b-2bdd-4902-8ca2-f4b39ad452f3/supuputi.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_off0000e390.bin
c875e9c093247ab65b01a169b798a215d4e8d10e95c73fb8e96bb17afa6ab6ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE390 5224 bytes
font_01_sfnt_off0000f53c.bin
db15d6883a31e5b63bd8a3f36a611b62b6dbfdf5a7d3acc691db44d8c5554945		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF53C 10464 bytes

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