Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e7e7e5bfeae0730…

MALICIOUS

PDF

61.5 KB Created: 2020-12-24 08:28:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abbaa2b8877541ed9ce4aa6c7bc717ad SHA-1: d436ff53e7f7eda23de3588b9de232daed61e23f SHA-256: 3e7e7e5bfeae0730788dd6a6d46bbeabf815dc6709d342a53305cc4d362af13b
156 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a phishing or spam campaign, indicated by the 'Pdf.Phishing.Trojan' ClamAV detection and a high ML classifier score. It contains a large number of external links, including one pointing to 'trafffi.ru', suggesting an attempt to redirect users to potentially malicious content or a link farm. The document body, though heavily obfuscated, contains references to 'Mortal Kombat Sonya Cosplay' and 'wkhtmltopdf', likely as lures.

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://trafffi.ru/123?utm_term=mortal+kombat+sonya+cosplay
    • https://bimomudunaxa.weebly.com/uploads/1/3/4/7/134757379/b318350ee.pdf
    • https://cdn-cms.f-static.net/uploads/4374847/normal_5fbdd2460f6ab.pdf
    • https://cdn-cms.f-static.net/uploads/4479433/normal_5fbf0549ae0ad.pdf
    • https://valefeka.weebly.com/uploads/1/3/5/3/135345526/8005416.pdf
    • https://muwubuzegutan.weebly.com/uploads/1/3/4/6/134649477/9138962.pdf
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/3532345.pdf
    • https://cdn-cms.f-static.net/uploads/4386593/normal_5f8deca87e7b5.pdf
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/mebuperusagir.pdf
    • https://girejegi.weebly.com/uploads/1/3/4/4/134490844/df3b0.pdf
    • https://sijaxidav.weebly.com/uploads/1/3/4/4/134499987/361764.pdf
    • https://narodejezagog.weebly.com/uploads/1/3/3/9/133988416/26378887d6.pdf
    • https://soravetojovon.weebly.com/uploads/1/3/4/8/134890923/wulibavup-kijaxerosagol.pdf
    • https://cdn-cms.f-static.net/uploads/4473047/normal_5fbce3067deac.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gebaxovudofe/92858002088.pdf
    • https://s3.amazonaws.com/takateg/hand_to_hand_combat_manual.pdf
    • https://uploads.strikinglycdn.com/files/048298f3-dc8e-4176-aafc-025d476e511b/zozevefesaguwikoxidowibo.pdf
    • https://uploads.strikinglycdn.com/files/54ffc7e1-48f2-4358-8452-31f8bb0a477e/fozutovekafovomudak.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_off0000b4e5.bin
a9359538ec668a10d968355e75ef1cfada2472796d4a3717aac2a5268baeaaa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E5 5392 bytes
font_01_sfnt_off0000c732.bin
72a11e77b0bdeb4bd523c185dbd9228a13b8c5ad8fd909f1af3d6e98a8455041		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC732 10072 bytes

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