Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19f770422658724…

MALICIOUS

PDF

66.5 KB Created: 2021-03-22 14:13:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 387ba2df67ae81e34ae9c1d476323b83 SHA-1: 92b3784e9a5ef5b97485c1dfafed01e12aea4eae SHA-256: e19f7704226587243639b6516b0bf08ba5044eb9d553c2a736507d036a66d5f6
204 Risk Score

Malware Insights

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

The PDF file contains numerous external links, forming a link farm, and is detected as malicious by ClamAV and an ML classifier. The document body, though heavily obfuscated, suggests a lure for downloading a PDF. The presence of 'cmd_commands_cd.pdf' in the document text hints at potential command execution or exploitation, likely to download and host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://leonvi.ru/wix?keyword=understanding+earth+7th+edition+pdf+free+download
    • http://filmera.ru/70818474921f805g.pdf
    • https://masezinonorokun.weebly.com/uploads/1/3/4/6/134685416/wobovixa_guxobuvanogux.pdf
    • http://fredo.run/57204476968r6024.pdf
    • http://xofebuledat.scienceontheweb.net/preposition_quiz_grade_3.pdf
    • https://bofakodejo.weebly.com/uploads/1/3/4/2/134265658/4c3ef30e0260ef.pdf
    • http://warokibujiz.getenjoyment.net/bufusiwefopa.pdf
    • https://riragipus.weebly.com/uploads/1/3/4/3/134358734/gimekamasowukosizow.pdf
    • http://exampl1214.com/mnemonic_strategiesyyf8i.pdf
    • http://fukuzowi.sportsontheweb.net/craftsman_dyt_4000_oil_filter.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/taturi/zikodatelamekanagatujaje.pdf
    • http://giduwenodi.epizy.com/rawovojareju.pdf
    • http://bifiwapaz.onlinewebshop.net/15418539382.pdf
    • http://najudugofuk.rf.gd/windows_10_cmd_commands_cd.pdf
    • https://s3.amazonaws.com/xovekolamoxe/tolkien_beowulf_translation.pdf
    • http://fonimegalidoxu.epizy.com/99219473206.pdf
    • https://s3.amazonaws.com/bezegoluzose/thomson_reuters_practical_law_guide.pdf
    • https://s3.amazonaws.com/napejaxosinages/zogiledipibo.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/
    • https://s3.amazonaws.com/xovekolamoxe/to
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6b8.bin
f48532bce93d392c16482bb66220d65caa0426c336999fdd1d1c49002e332e6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B8 5464 bytes
font_01_sfnt_off0000d96b.bin
0b67b5d775f9af4647acca6e0866108c4dc61ac9a204e9ba46ac86bd008c7812		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD96B 10280 bytes

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