Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b6c3787bcb413c…

MALICIOUS

PDF

59.1 KB Created: 2020-11-19 23:36:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: dbd88fa53ad5836f9070cb070ba12914 SHA-1: 2c2f6b5d360f9ee0eec23f6655d16c86919948c8 SHA-256: 31b6c3787bcb413c90b6b3cf6273e3d90ca6e7e0cf15ffeebfbbf3a1e73a7569
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious domain, trafffi.ru. ClamAV and an ML classifier flagged this file as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests it is masquerading as a template, a common lure for phishing attacks. The presence of external URIs indicates an attempt to redirect the user to a potentially malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffi.ru/aws?utm_term=microsoft+word+weekly+calendar+template+2019 PDF link annotation
    • https://walutosewog.weebly.com/uploads/1/3/4/3/134312240/d06d7768026.pdfIn PDF document text
    • https://luwobidope.weebly.com/uploads/1/3/0/8/130814225/5787213.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_5fae0e63f0a43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408599/normal_5fa4aa1b796c1.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/pewaduvawafora-xubuxofibazunap-rofaras-biwaw.pdfIn PDF document text
    • https://zitavumerut.weebly.com/uploads/1/3/4/4/134465292/c834c9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/25036447627.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/baby_birthday_party_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wifozuxeku/the_dragonbone_chair_wiki.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/a_typical_housing_lease_may_require_a_tenant_to.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/renusititutab.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/74526013046.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/portfolio_recovery_associates_judgement.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAD8 6048 bytes
SHA-256: 3cc29da6e324a31af925d09bf7911ff51c24b5bfb8e4b85d467589bebc611c6c
font_01_sfnt_off0000bf87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF87 9452 bytes
SHA-256: 369cdc41e9c9509b0a02aa0456fd4a628975c21ab9de15bd090a4f1aad87a1af