Malicious PDF — malware analysis report

Static analysis result for SHA-256 38cc9ba8adbc52e8…

MALICIOUS

PDF

74.2 KB Created: 2020-11-18 10:38:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5747598ce5f20b89b8d1468f6da93e1b SHA-1: 5c96f367c7554f515a0876571b9a4ca670d8b651 SHA-256: 38cc9ba8adbc52e8b44a90e3c5f63fcb5dc3d900a51865a6c0aff8ad1b58c529
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or spam document. It contains numerous external links, including one to 'trafffi.ru', suggesting an attempt to redirect users to malicious websites. The document body, though heavily obfuscated, appears to be a lure related to 'batch processing in jdbc'. No scripts were extracted, but the presence of many external links points to a link-farming or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafffi.ru/aws?utm_term=how+to+perform+batch+processing+in+jdbc
    • https://cdn-cms.f-static.net/uploads/4405953/normal_5fb2b51362830.pdf
    • https://rotutokobuzafoj.weebly.com/uploads/1/3/4/4/134455929/7263743.pdf
    • https://dedaruxije.weebly.com/uploads/1/3/4/4/134455514/jefodefajobedidixak.pdf
    • https://tejukikefuxod.weebly.com/uploads/1/3/4/7/134703803/dewinesoraj.pdf
    • https://cdn-cms.f-static.net/uploads/4415077/normal_5fadb18bc34fc.pdf
    • https://cdn-cms.f-static.net/uploads/4486975/normal_5fafdf544a4ec.pdf
    • https://cdn-cms.f-static.net/uploads/4378604/normal_5f8c18e0a940d.pdf
    • https://palifeselaliku.weebly.com/uploads/1/3/4/4/134441248/wakizusorilikomil.pdf
    • https://cdn-cms.f-static.net/uploads/4424637/normal_5fa2476f5345e.pdf
    • https://cdn-cms.f-static.net/uploads/4502236/normal_5fb3fa96b2373.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/a261bc76-dc8c-4412-b464-3bbcaf7a2617/fivopajobagarufademazepe.pdf
    • https://uploads.strikinglycdn.com/files/6248dc65-e062-48be-b642-a0c93673cbbc/5861197485.pdf
    • https://uploads.strikinglycdn.com/files/b2ccef67-740b-4746-8a19-0a5cb17d99e0/32485904872.pdf
    • https://uploads.strikinglycdn.com/files/45f0d437-a52f-4361-a81a-709d232b4ea1/christian_radio_denver.pdf
    • https://uploads.strikinglycdn.com/files/b2634099-60a7-46ef-8b37-42d02a0a6aaf/mukapuniraga.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d468.bin
d21d6a5d21bf971a1514ac7e1464c1181201c7fc5cd965e63170d4c989c328b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD468 5592 bytes
font_01_sfnt_off0000e750.bin
723df232352d17afe7720123b657c513200fba5881a70749cc5e598ca3fbb943		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE750 11216 bytes
font_02_sfnt_off00010d9f.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9F 4324 bytes

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