Malicious PDF — malware analysis report

Static analysis result for SHA-256 533071398d011458…

MALICIOUS

PDF

77.5 KB Created: 2021-04-20 14:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5364552d0861c8b66b4e45c4cc325fd1 SHA-1: 18e45d8eb96f166f010e2f99e905722fa32c9a1e SHA-256: 533071398d01145824ee8f4e05c804543fd2ca9f527273e09acb801195be3312
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a ClamAV detection and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'vilenefex.ru', which is likely used for phishing or to download a secondary payload. The document body, though heavily obfuscated, contains text related to 'On the origin of species first edition price', suggesting a lure to entice users to click the malicious link.

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://vilenefex.ru/strik?utm_term=on+the+origin+of+species+first+edition+price
    • https://cdn-cms.f-static.net/uploads/4417321/normal_603bf97d5e4ea.pdf
    • https://cdn-cms.f-static.net/uploads/4367680/normal_60323e075dd28.pdf
    • https://rifubagozoj.weebly.com/uploads/1/3/2/6/132695416/ritatemeravaj.pdf
    • https://static.s123-cdn-static.com/uploads/4475564/normal_5ffe69ce7f07d.pdf
    • https://cdn-cms.f-static.net/uploads/4470402/normal_606ab5e12eb73.pdf
    • https://cdn-cms.f-static.net/uploads/4479446/normal_5fe78930c8ca9.pdf
    • https://cdn-cms.f-static.net/uploads/4475392/normal_60601da94246b.pdf
    • https://static.s123-cdn-static.com/uploads/4490917/normal_5ff02b5458401.pdf
    • https://lopepuru.weebly.com/uploads/1/3/4/3/134320072/3549215.pdf
    • https://cdn-cms.f-static.net/uploads/4449766/normal_6016c5c50b761.pdf
    • https://cdn-cms.f-static.net/uploads/4376600/normal_602795cde1e2a.pdf
    • https://mukixobi.weebly.com/uploads/1/3/4/7/134732615/wojituxalon_sivaribuwabep_zazatuzidewete_sixikuduledi.pdf
    • https://static.s123-cdn-static.com/uploads/4407102/normal_60066c771eb31.pdf
    • https://popuvagilubasi.weebly.com/uploads/1/3/4/0/134018524/99c459df69490fe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zidenigad/kajavoponibevijopimin.pdf
    • https://s3.amazonaws.com/dowavelaxam/dutabi.pdf
    • https://s3.amazonaws.com/sumesawoxajew/majalufuwadizefugedopejo.pdf
    • https://s3.amazonaws.com/jezobasit/how_do_i_pair_my_microlife_blood_pressure_monitor.pdf
    • https://s3.amazonaws.com/jujadodedaruxix/1142570245.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f062.bin
e74960e8063d50a9b65cef40caf9d9becbeba570a9c24a1c849f76ab24a35935
pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 5204 bytes
font_01_sfnt_off0001021d.bin
6effb69ada5056b0dc62c0e8ea8628f57587261ce9fae7af1b80c5e57928dca7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1021D 10824 bytes