Malicious PDF — malware analysis report

Static analysis result for SHA-256 581e9a2cda3ab694…

MALICIOUS

PDF

70.9 KB Created: 2021-04-10 16:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d313e8913fa79c3bc3ab2858bdeb132e SHA-1: bade6b3ae011d9061306b3d040d24f1b3c98f885 SHA-256: 581e9a2cda3ab694300f76eae08c7850d2d862fae92135fc5a7daccf213071a5
166 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document is designed to trick users into downloading a password-protected archive, a common tactic to evade gateway scanning. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt, potentially involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9626

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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 http://www.friendlycc.com/sites/default/files/webform/47778491084.pdf
    • https://www.cdcplumbing.com/sites/default/files/webform/contact-us/sawifujemenolezaf.pdf
    • https://www.clinicasfantamaria.ro/sites/default/files/webform/33767122539.pdf
    • https://aboss.by/sites/default/files/webform/zivexovoburowunaxomenip.pdf
    • https://www.jwico.com/sites/default/files/webform/23528315583.pdf
    • https://ambrose.edu/sites/default/files/webform/futexapepunuvanujom.pdf
    • https://ambrose.edu/sites/default/files/webform/zateguzafafidefezibexe.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/doxuwekuwazomiloxeri.pdf
    • http://seiary.com/sites/default/files/webform/rec/jizexatunurometubukos.pdf
    • https://www.mothercare.ro/sites/default/files/webform/resumes/sojivezogi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=procesos+constructivos+weber
    • https://www.vub.be/sites/vub/files/webform/fazarixi.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e13a.bin
5eab94f9605b6ce61ee313f93b10466d1580992525f48f69d6377188cfff84df
pdf-font-stream PDF embedded font (sfnt) at offset 0xE13A 4844 bytes
font_01_sfnt_off0000f1de.bin
479cc55910c1b54fad1e6ec66e0677fe15e9a610a7dbe61f9a7702e07affb224
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DE 11816 bytes