Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7bdb44a00628c3…

MALICIOUS

PDF

80.0 KB Created: 2021-03-08 14:45:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2cc60b88c407792e70ad6c389dd087e SHA-1: 4abf41b78887645c059970858c994db80c3b3b56 SHA-256: ef7bdb44a00628c39d37d7e95cc6455614db47d70bbc3c61848f78f27530a274
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to suspicious or unknown domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'Buzzfeed book gift guide' and 'wkhtmltopdf', likely a lure to direct users to malicious content hosted at URLs like druttle.ru.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9082

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://druttle.ru/123?utm_term=buzzfeed+book+gift+guide
    • https://cdn-cms.f-static.net/uploads/4454982/normal_6018a4cb2653d.pdf
    • http://bigchance.pw/786879627535g7ms.pdf
    • http://geekcods.com/804442676588kjjp.pdf
    • http://auto-agents.space/ziliwozixalovagisitawusujqwof.pdf
    • http://dilomevoje.22web.org/drinkwell_pet_fountain_filter_instructions.pdf
    • https://cdn-cms.f-static.net/uploads/4426571/normal_603a4ba989f0b.pdf
    • https://static.s123-cdn-static.com/uploads/4368782/normal_5fc8148ac1703.pdf
    • http://bcipreactivaperu.com/nasacort_vs_flonase_vs_nasonexwott5.pdf
    • http://springtea.space/jawekatatuxatexabi3hvfk.pdf
    • http://cupe1.ru/72605199408p4v4k.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3123e891-76ee-48b7-8e8e-8cb85e8c66d9/samsung_nx300_price_australia.pdf
    • https://uploads.strikinglycdn.com/files/ed83a4ff-4780-47d7-95f6-e6612286f598/what_is_40_acres_in_square_feet.pdf
    • https://s3.amazonaws.com/wutisigila/clozapine_blood_monitoring_guidelines_uk.pdf
    • https://s3.amazonaws.com/vaxebisapesi/vanguard_zero_demo.pdf
    • https://uploads.strikinglycdn.com/files/3f763b00-92c7-4069-b743-241a98944560/77117772631.pdf
    • http://zesexabipezu.epizy.com/kukafixogaloguneg.pdf
    • https://s3.amazonaws.com/mexijegedakol/sutidebebuzeseni.pdf
    • http://bojuzafi.rf.gd/factual_report_writing_example.pdf
    • http://dokufexazag.epizy.com/zivabigoremagarogojijekaf.pdf
    • https://uploads.strikinglycdn.com/files/af07aff2-cfea-4720-9c6e-296b86c94fd1/5903259447.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb20.bin
03cdaeedf9544e9b996c59d4968aab61278aa46a7f056c1ff02415322d8a3ed6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB20 4864 bytes
font_01_sfnt_off00010bd5.bin
0a176ee4ffdcccacea5cbeb01b4d2294b7f9ad809c9278f5bfe4e227e0f44be6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD5 4584 bytes
font_02_sfnt_off00011848.bin
70958e0af333aa204fe8f62d66c7d47ff42f7c94ed79977eacb85db080bc8020		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11848 11024 bytes

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