Malicious PDF — malware analysis report

Static analysis result for SHA-256 386abdd15a9a1507…

MALICIOUS

PDF

86.1 KB Created: 2021-04-15 01:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 403295ad498f42b63feb29f399d5bf34 SHA-1: 63dbf1c8832e4f4bb8d2c3844cd3d42207aedc08 SHA-256: 386abdd15a9a15078eccc614c9e512fc38f4e7681393ca4eb355f65b67a1a9d7
134 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a lure to download a secondary payload, likely a trojan as suggested by ClamAV.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://www.mainephilanthropy.org/sites/default/files/5296457674.pdf
    • http://seiary.com/sites/default/files/webform/rec/netugapufuzutazegiwiwivi.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/basolidigululaba.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/nunemoxajusadokuxilebe.pdf
    • https://www.woonsocketri.org/system/temporary/webform/danajon.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/86947183128.pdf
    • https://ambrose.edu/sites/default/files/webform/85138354947.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/10654010608.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/dufovomajaxavekasodulep.pdf
    • https://www.jwico.com/sites/default/files/webform/xojisipet.pdf
    • https://ambrose.edu/sites/default/files/webform/65047245793.pdf
    • https://www.blplegal.com/sites/default/files/webform/lolavojirubopikumu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=catholic+bible+mp3+free+download
    • https://campusrec.princeton.edu/system/files/webform/luzatebinibaxopititum.pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/wetesagepe.pdf
    • https://drones.princeton.edu/system/files/webform/66931006591.pdf
    • https://www.healthdata.org/sites/default/files/resumes/fanonexujezurexuli.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117df.bin
6597754634816f4817af26b2e90d0517338cc9c620567ab9ae3efd0c381cacc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117DF 5516 bytes
font_01_sfnt_off00012a7f.bin
b02de9c732739538e92c0c43a0e0abf3897b667c015ac608fa28d28ffa786adf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7F 11660 bytes

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