Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf2945ba73e5c27…

MALICIOUS

PDF

66.8 KB Created: 2020-12-05 12:22:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0c450fdcf4c70fb16021e6e0b2ef0f5 SHA-1: 5c6a5afb9f222328bcfb1d7977d304a4dfad6d4b SHA-256: 4bf2945ba73e5c27c117bff27d649afae916068d8d56b0e04894499f14601ce1
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 'https://traffset.ru/strik?utm_term=1990+f150+manual+transmission+fluid', which is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to vehicle maintenance information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/strik?utm_term=1990+f150+manual+transmission+fluid
    • https://cdn-cms.f-static.net/uploads/4393631/normal_5fb89f7364931.pdf
    • https://cdn-cms.f-static.net/uploads/4390373/normal_5f921079c80c7.pdf
    • https://cdn-cms.f-static.net/uploads/4446643/normal_5fa4f0a064082.pdf
    • https://kivalake.weebly.com/uploads/1/3/4/8/134885121/2620103.pdf
    • https://cdn-cms.f-static.net/uploads/4464724/normal_5fa6cdb0b1ec5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fofeguj/zugesapisopaj.pdf
    • https://uploads.strikinglycdn.com/files/9cafc2d3-ca9c-4a8c-be85-36040230dc84/kipeliluzo.pdf
    • https://s3.amazonaws.com/biwuwukesazef/graphic_design_portfolio_template_free.pdf
    • https://s3.amazonaws.com/henghuili-files2/arduino_code_library.pdf
    • https://uploads.strikinglycdn.com/files/a7336851-f927-4857-91f6-dc4609b9db0d/871239593.pdf
    • https://static1.squarespace.com/static/5fc53589df132613bbd9bff0/t/5fc83ae6d6e0cc37e3354ca0/1606957799453/taromogiveruxesosorunufu.pdf
    • https://s3.amazonaws.com/zonivezada/32904797925.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_off0000c9ab.bin
87f2635c1fd36e0efab5d3e1c4b434b70dc4a2f24c250e2dd257968e8eaf749e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AB 5432 bytes
font_01_sfnt_off0000dc13.bin
18a49f7163b40455c15a10ba9f64f5661e7c902f168702aaff57e25787245858		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC13 10188 bytes

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