Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c4aabb5ba9d33e…

MALICIOUS

PDF

85.7 KB Created: 2021-03-06 08:18:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cfda8821569468283996daa7f2dd43cb SHA-1: b1e7ff68318c12b3c41c7bc3a4d7c2c176cf1535 SHA-256: b5c4aabb5ba9d33ecd60559e2d25252dac6d72b9f76c757df0eac4cf303b0576
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL, identified as a high-risk indicator. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document body, though heavily obfuscated, appears to reference a guide, reinforcing the lure tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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://jumiwimov.ru/wix?keyword=one+small+favor+osrs+quick+guide PDF link annotation
    • http://gagimubu.mywebcommunity.org/xaregomoda.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/76405341742.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383146/normal_60022357a7d8e.pdfIn PDF document text
    • http://finomimetafix.sportsontheweb.net/ti_84_ce_used.pdfIn PDF document text
    • http://meetsol.xyz/zizurijufevoloxuhvrnr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406771/normal_5fd2dde5682be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407780/normal_5ff801dd8f7dc.pdfIn PDF document text
    • http://mon-fortuneo.best/sex_ideas_christian_marriagem1wff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411491/normal_60419f4da52f7.pdfIn PDF document text
    • http://cardio-active.site/zqg4b.pdfIn PDF document text
    • http://nowtorrentz.com/ripofarererenibulf2lb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470821/normal_5fc7f6f8bd8ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/space_invaders_pinball_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/37007330997.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/guide_champignon_comestible.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/rufujok.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/three_examples_of_spreadsheet_software.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/jajemosakedogig.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/traffic_report_dumbarton_bridge_ca.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/anjathe_movie_songs_masstamilan.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/87144142621.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/lopuzuviguxadazeb.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/97302623272.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/mufuzimavifiweloka.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F96 5620 bytes
SHA-256: c9a194165265fc3bb8169b098c32f63c980ee80b43d9e219183e7c5a562de008
font_01_sfnt_off00012298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12298 11760 bytes
SHA-256: 9a85c1c51843318e4d5a3e31174ab15a648fd63cf6b29028f0a98ebe24403176

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