Malicious PDF — malware analysis report

Static analysis result for SHA-256 231bca0b1e201a17…

MALICIOUS

PDF

74.6 KB Created: 2020-12-16 17:54:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8be7ea440bce36317ecc348cf5e9a75 SHA-1: 5a89f1208b40a49278ac2bd3dca14b76d77761da SHA-256: 231bca0b1e201a171ed1bb5723141273b9f2b1475c685d03a898b66ef97e2c1f
104 Risk Score

Malware Insights

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

The file is identified as malicious by a ClamAV signature and an ML classifier. It contains an embedded URI pointing to 'traffset.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to a 'refrigerator service manual', combined with urgency language, to trick the user into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/123?utm_term=true+refrigerator+service+manual
    • https://cdn-cms.f-static.net/uploads/4378827/normal_5f8edc4f1b09f.pdf
    • https://cdn-cms.f-static.net/uploads/4373778/normal_5f8cc4288e0ad.pdf
    • https://cdn-cms.f-static.net/uploads/4475564/normal_5fae7e5b65793.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/909eb329-81d8-43aa-8d34-1f8872d78cf9/43831820696.pdf
    • https://static1.squarespace.com/static/5fc066bd9955c744b5390948/t/5fc0e696145a8629dcd20bec/1606477467819/how_to_read_literature_like_a_professor_audiobook_chapter_1.pdf
    • https://static1.squarespace.com/static/5fcf7019c0575613efdf100f/t/5fd6fc6772b1137fa98bcce6/1607924842004/86763977920.pdf
    • https://s3.amazonaws.com/gupawupigawono/xosarobonumavitetakidup.pdf
    • https://static1.squarespace.com/static/5fc2c6032e34347c70505203/t/5fceb984efbed7192ce08f48/1607383429118/road_rage_movie.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd1fe1d2806c62ec201ccc/1606229986159/dragon_bridge_skyrim.pdf
    • https://static1.squarespace.com/static/5fc703795c272238a8179ca4/t/5fcac57674c1090e4629f788/1607124344243/60041135647.pdf
    • https://uploads.strikinglycdn.com/files/872840f5-3ab3-438e-a1c7-f48a91050d4f/disawomowivuk.pdf
    • https://static1.squarespace.com/static/5fc0805cd49dd12447321748/t/5fce56fa83d2ac65cc44fe04/1607358203086/54335108924.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d334.bin
f6d899084b870e0dcb7553121bc79c596a6f7641746e7a17efae3a565cff32a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD334 5208 bytes
font_01_sfnt_off0000e4e3.bin
db479f3a7938b407d9d4fdfe174e44e390a56c7fb0ea552478d6c1bd67b6dfdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E3 10264 bytes
font_02_sfnt_off00010810.bin
f260341e2deafef282c0cdf6f9547f7c1575836931e00f2cecf0e77490754097		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10810 16232 bytes

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