Malicious PDF — malware analysis report

Static analysis result for SHA-256 1defdaf14c4969be…

MALICIOUS

PDF

79.5 KB Created: 2021-02-03 05:58:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 06d583b29f3eed38307cfe4d411c0c08 SHA-1: b573a2ccd7c8a8e0f46b438029706bac0ea163b4 SHA-256: 1defdaf14c4969bede444432140054a3d0cfa04ce0f0f8e10956a13db8ee83b7
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating it's a phishing trojan. An external URI pointing to 'maypoin.ru' was extracted, suggesting a phishing lure. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'object oriented programming interview questions and answers', which may be used to trick users into opening the malicious PDF.

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://maypoin.ru/123?utm_term=object+oriented+programming+interview+questions+and+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375708/normal_6018b098b5880.pdfIn PDF document text
    • http://liketime.online/dirudusanxyrs6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416932/normal_5fca7cfc18556.pdfIn PDF document text
    • http://wellwork.site/acoustical_engineering_harry_f_olson34o9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477400/normal_5ff33c1946998.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412894/normal_5fec2ecf483a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziboporo.epizy.com/zuziloro.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/22270577725.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/safuguzaletufoloxexa.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/ugly_duckling_don_t_sub_indonesia.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/nisogefififapameneludano.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/dawn_of_man_achievement_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/2890491367.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/71901557650.pdfIn PDF document text
    • http://memegimowa.epizy.com/80801600593.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/python_automate_the_boring_stuff.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/57762281499.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/vaterizazo.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/declaration_of_trust_template_property.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_off0000f8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A2 5880 bytes
SHA-256: be607e5f16edad393cccaf20c3469c1199f57eda09460ec89f23babb83498b1b
font_01_sfnt_off00010c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C96 10408 bytes
SHA-256: a5587d7b9485d12f699e5ef7d5b14260d5b9096220a9acf74f5d8a791184f5f1

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