Malicious PDF — malware analysis report

Static analysis result for SHA-256 376e0ed9bb5068e4…

MALICIOUS

PDF

76.2 KB Created: 2020-11-17 13:44:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91c54a31670b21fe5b7d4d45910a7f31 SHA-1: 5ccf3cc5f5b3934ac49b4aa33b7e31cded87168b SHA-256: 376e0ed9bb5068e49134bad1d015bed1d530a5d71152a1969ce68f5cf8870e40
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign content, but one suspicious URL (traffine.ru) is present. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The document body, though heavily obfuscated, contains references to 'city bus driving games unblocked', suggesting a lure to attract users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-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://traffine.ru/123?utm_term=city+bus+driving+games+unblocked
    • https://mogezisatizate.weebly.com/uploads/1/3/0/7/130775403/ff3ab70bb12c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b67971e3-1a11-4e06-b5ff-3c905e12f99a/31333703971.pdf
    • https://uploads.strikinglycdn.com/files/eaca5b46-5cdc-4645-bbfd-7c40257e41af/lixase.pdf
    • https://s3.amazonaws.com/bededuxotulapil/riptide_gp_renegade_apk_download_free.pdf
    • https://s3.amazonaws.com/kukazowox/63841720565.pdf
    • https://uploads.strikinglycdn.com/files/749ddb1b-dfa7-40ba-b5a4-c09f569f5745/nijejofaniwexuzob.pdf
    • https://uploads.strikinglycdn.com/files/d6acffaa-27d4-4b4e-9894-d2e579252f74/kotevoxeripu.pdf
    • https://uploads.strikinglycdn.com/files/f9e63303-fbb7-4af5-b130-06883d4bbb96/sarufele.pdf
    • https://uploads.strikinglycdn.com/files/c81b49c8-560f-4d47-a253-b712566e074b/astm_a307.pdf
    • https://s3.amazonaws.com/sirilagewuga/xerox_workcentre_5945_secure_print_driver.pdf
    • https://uploads.strikinglycdn.com/files/8a5c391b-6642-4801-baff-976a904901c9/galovomodut.pdf
    • https://uploads.strikinglycdn.com/files/3284144c-00c4-48fc-b7d3-c68062c5eccd/41228065401.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000fe5b.bin
080a860ade8cb84e3a4c1da761ac7cee7d80bb7c9037f785e243e2777f24644f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFE5B 20984 bytes
font_00_sfnt_off0000c8c0.bin
f58953779e16e3920a321aaa61a7fdae338ebf22df60a25cb52055a586b2e814		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C0 5528 bytes
font_01_sfnt_off0000db82.bin
b7e5743e38a992cf3c164409f88d722b1f464472037b15ee1938379e142ebb2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB82 10124 bytes

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