Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb2c26e0a2092a4a…

MALICIOUS

PDF

80.4 KB Created: 2021-04-07 15:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b106a1d77949ef40cafc7b57aeb2ea93 SHA-1: 6182659e2d0c0bcf8b9b2908526e62c460523330 SHA-256: cb2c26e0a2092a4a18c170b93fe94d6b3ff6d54b16cdb38dcc35774300b04f1a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL being `https://resalured.ru/strik?utm_term=does+taco+bell+have+a+secret+menu`. This suggests the document's primary purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/strik?utm_term=does+taco+bell+have+a+secret+menu
    • https://mitiguranam.weebly.com/uploads/1/3/4/4/134456526/wadonu-falabavinakum-zaxibibodako.pdf
    • https://mefupajudeto.weebly.com/uploads/1/3/4/8/134883840/49dfbfeba4.pdf
    • https://static.s123-cdn-static.com/uploads/4390643/normal_5fc9dd050562d.pdf
    • https://cdn-cms.f-static.net/uploads/4502236/normal_5fe7909f69576.pdf
    • https://cdn-cms.f-static.net/uploads/4415302/normal_5fe899ebe49b7.pdf
    • https://cdn-cms.f-static.net/uploads/4452381/normal_603a0c70ae0c2.pdf
    • https://rosikotukixaru.weebly.com/uploads/1/3/4/3/134312973/wobubu-beretonamuvosas.pdf
    • https://neruzubegakakew.weebly.com/uploads/1/3/4/0/134017499/3ebe36c9.pdf
    • https://litokotivugobud.weebly.com/uploads/1/3/2/6/132695550/055b732.pdf
    • https://rijijuxika.weebly.com/uploads/1/3/5/3/135346754/purubivinudakinek.pdf
    • https://gaburidukir.weebly.com/uploads/1/3/4/4/134463400/2994596.pdf
    • https://muluxadi.weebly.com/uploads/1/3/1/4/131453645/xexovatomuxizot.pdf
    • http://bejojutota.iblogger.org/dutch_oven_vegetable_recipe.pdf
    • https://sogakuguw.weebly.com/uploads/1/3/1/4/131453515/xasuzi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b7f5b04e-b247-49a4-9dc0-39f0c843ec09.filesusr.com/ugd/b56f86_af6ea3a6d12146de9726217994e97dc3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/096a795c-5212-413b-b5f3-742b5d0c408b/4181625017.pdf
    • https://uploads.strikinglycdn.com/files/68e1f8c4-09be-43f9-8dea-b3947a0ee3c3/95894981204.pdf
    • https://36fde204-cda4-4268-899b-58717f9005d0.filesusr.com/ugd/b13063_ac495d30d4ff4eabb2101787b20b2bcb.pdf?index=true
    • http://muzififezi.rf.gd/50944986766.pdf
    • http://palalujopaxuv.epizy.com/83845190685.pdf
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_f3b311028232421fb579dc4f4705c22a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/be587066-e97f-4f44-b2c4-4402c9e1354d/analog_devices_digital_design_engineer_interview_questions.pdf
    • http://zidotafezanu.epizy.com/cad_viewer_free.pdf
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_6253ffffce2a4e05825fafdd149e5b4c.pdf?index=true
    • 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_off0000fb98.bin
a2095fc3b9ae9d3ea7df007fe92b3b4262b9c39536fce5024064c5fe55865990		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB98 5236 bytes
font_01_sfnt_off00010d46.bin
d91f48abebbd9057008a6c2dd6c9ad0181c82f6dfc4f6fac73270072bdffd6da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D46 10988 bytes

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