Malicious PDF — malware analysis report

Static analysis result for SHA-256 56341a582f642d34…

MALICIOUS

PDF

71.7 KB Created: 2021-01-10 18:56:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d2bedd3eec3074774aa857137229ff48 SHA-1: 761195d31a2cdd9b5ec8d2a72a8bf44418e05ad6 SHA-256: 56341a582f642d34dd72a0d4421381932369b9fe78a8a6c4ac95b8f9b5e4d9cd
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classification and ClamAV, with a specific ClamAV detection name indicating a phishing trojan. An external URI pointing to 'trafffi.ru' was extracted, suggesting a phishing lure. The document body, though heavily obfuscated, contains text related to message export and the authoring application 'wkhtmltopdf', which could be used to disguise malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/123?utm_term=msg+to+vcf+export PDF link annotation
    • https://cdn.sqhk.co/zexukobesu/hj8Viab/41471577965.pdfIn PDF document text
    • https://cdn.sqhk.co/wodaximewule/hbifTjg/volume_booster_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/sesijisova/aiaiagg/shark_ionflex_battery.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378604/normal_5f8a1b80c67d9.pdfIn PDF document text
    • https://cdn.sqhk.co/perigupa/hcUhbWm/manager_classworks_dekalb_schools.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_5fd1086b9ef8d.pdfIn PDF document text
    • https://cdn.sqhk.co/zufuxirap/3ZNjhWS/tv_serials_ringtones_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482406/normal_5fcee37047221.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503874/normal_5fb2b2e924ee3.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/xasovewipeje/xesakezesakazalub.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/97327825893.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/beechcraft_king_air_c90_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/lobexelasokatibekonufa.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/zovomonezekofog.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_off0000dbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC7 5076 bytes
SHA-256: 999dd00865e72fb30467fc9797c0050ed5e3b7e4de601472182d41ea0eb5dd92
font_01_sfnt_off0000ed40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 10712 bytes
SHA-256: 40b0389f410e62fcc86b7e47241a5e6a761f6415a41ee5788c6bf6cfc8447c02