Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da153e70f5a5f55…

MALICIOUS

PDF

80.4 KB Created: 2021-05-31 17:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d3d85c42cca3118db63940caa43eb80b SHA-1: a16ff619eed506a19580e5c1151f889255f812cb SHA-256: 8da153e70f5a5f5553ec06afe73059266902344e8e00d7d40d6fc473fa373522
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'cructi.ru', which is likely a phishing or malware distribution domain. The document body, though heavily obfuscated, appears to be a lure related to printer troubleshooting, a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://cructi.ru/pbw?utm_term=how+do+i+factory+reset+my+epson+printer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478946/normal_606a96afe78a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418000/normal_600aae02748d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422180/normal_6017b214243a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419836/normal_605a46e2a428d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475853/normal_6045fc8ca3c4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466680/normal_60479292540bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382962/normal_6016c63e961f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484399/normal_5fcfb8ee012c1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/643f6247-6462-4530-ae73-9740007e039e/magusajam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c19ca32-7d30-404b-8332-0b426afca97c/how_to_find_bond_order_of_co32-.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ee90d7b-f1ce-426e-a9ee-6da32311ca1a/systems_engineering_uk_university.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/f/how_to_make_deep_house_beats_on_fl_studio_12.pdfIn PDF document text
    • http://mumubib.pbworks.com/w/file/fetch/144413745/dovosufema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d334864-7b0e-498e-ade6-3f2844f5014a/why_does_my_washer_agitate_but_not_spin.pdfIn PDF document text
    • http://zemenifinabe.pbworks.com/f/17198002891.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144414729/types_of_register_in_english_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35231cdb-8c75-4fb3-84ff-3ec758418d14/why_wont_my_shark_vacuum_brush_spin.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_off0000fc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC93 5424 bytes
SHA-256: b1bc9480ab79cd07f1ef3175942b2383acca70e972c445e455dc1ce00e3ebf57
font_01_sfnt_off00010f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0D 10948 bytes
SHA-256: 5a13dfa512b5e6f31999d9e366708cf000ea636fcbac9082d20b53c7a20d8bc2

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