Malicious PDF — malware analysis report

Static analysis result for SHA-256 911ed2c96afc220a…

MALICIOUS

PDF

71.7 KB Created: 2021-06-08 19:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11fcc372a7800e3e6ba23d1e3d16c415 SHA-1: 067fe6c9825971e8cd1279d479db48cc93c9e562 SHA-256: 911ed2c96afc220a0b8cf7835806895e5c14517263cfea708e32f6b719e1147f
104 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The embedded URL points to a suspicious domain, likely serving as a lure for the user to download a payload. The document's metadata indicates it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, which can be abused for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/pbw?utm_term=dayag+2021+solution+manual
    • https://cdn-cms.f-static.net/uploads/4495254/normal_605d717a997ab.pdf
    • https://static.s123-cdn-static.com/uploads/4477638/normal_5feeb9cc1adf4.pdf
    • https://static.s123-cdn-static.com/uploads/4404740/normal_5ffcb9dc8ce4f.pdf
    • https://cdn-cms.f-static.net/uploads/4368952/normal_60298c3686004.pdf
    • https://cdn-cms.f-static.net/uploads/4482629/normal_5fd876583ce5c.pdf
    • https://static.s123-cdn-static.com/uploads/4499341/normal_5fcf1b7a54d76.pdf
    • https://static.s123-cdn-static.com/uploads/4381730/normal_6004193283623.pdf
    • https://cdn-cms.f-static.net/uploads/4382780/normal_60535c559d631.pdf
    • https://cdn-cms.f-static.net/uploads/4411270/normal_604d1dc522196.pdf
    • https://cdn-cms.f-static.net/uploads/4481663/normal_605d9144c1266.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/db608070-7898-4933-835d-b1bccab250cf/48414198397.pdf
    • https://uploads.strikinglycdn.com/files/e7bac759-303d-49df-86f0-66b3bc3986aa/beneficios_de_baarse_con_agua_fria_y_tibia.pdf
    • http://tujelupirobe.pbworks.com/f/42122656569.pdf
    • http://gupiguna.pbworks.com/f/the_seventh_most_important_thing_book.pdf
    • https://uploads.strikinglycdn.com/files/1e702e57-70d4-466a-a967-5770d0bcb1f4/james_baldwin_the_fire_next_time.pdf
    • https://uploads.strikinglycdn.com/files/a05cf858-567e-4bb2-87c6-15990f138631/quran_translation_english.pdf
    • https://uploads.strikinglycdn.com/files/25b61c80-005e-4950-a537-199e3dbec0d5/what_hotel_collapsed_in_new_orleans.pdf
    • http://kepojijudiva.pbworks.com/w/file/fetch/144564537/zoporuv.pdf
    • http://wixugigir.pbworks.com/w/file/fetch/144438558/hermite_interpolation_formula_derivation.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce92.bin
66efe3ff319b187027c682f685e978f58dc9c771f87218d5454ad40cafe60c64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE92 5100 bytes
font_01_sfnt_off0000dfdc.bin
231f388bc144d390e4b428c593cb62444632b65c8887c14a0aa02f947a3fd57e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDC 10632 bytes
font_02_sfnt_off0001038e.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1038E 4324 bytes

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