Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3a92a79b9fe92e…

MALICIOUS

PDF

65.3 KB Created: 2021-04-11 12:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c504b20f648d9053d14c7974f55a7e9 SHA-1: 44675b9fb96dd315d2602513de930fd4a1eac4c5 SHA-256: fa3a92a79b9fe92ea7d3c22dae93f46805ccb54dfff38c75f7acd7a8b1672be7
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document body, though heavily obfuscated, suggests a lure related to an 'Iowa algebra aptitude test', likely a pretext for malicious activity. The presence of numerous embedded URLs, some pointing to potentially compromised or unknown domains, further supports the malicious intent, possibly for credential harvesting or second-stage payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

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
  • 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 https://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/6659556688.pdf
    • https://www.woonsocketri.org/system/temporary/webform/danajon.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/85322732160.pdf
    • https://www.telluridescience.org/sites/default/files/tstc-applications/38780162719.pdf
    • https://www.a1touchsolution.nl/sites/default/files/larigujumikanezazezogiwi.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/15691680518.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/604022749.pdf
    • https://www.a1touchsolution.nl/sites/default/files/95216779236.pdf
    • https://ambrose.edu/sites/default/files/webform/82598578892.pdf
    • http://www.guninetwork.org/system/files/webform/heirri_proposals/32710798707.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=iowa+algebra+aptitude+test+6th+grade
    • https://www.vub.be/sites/vub/files/webform/fazarixi.pdf
    • https://campusrec.princeton.edu/system/files/webform/18758627140.pdf
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/kozavexol.pdf
    • https://printandmail.princeton.edu/system/files/webform/54002061309.pdf
    • https://printandmail.princeton.edu/system/files/webform/ziwilijevugibapuvoboka.pdf
    • https://printandmail.princeton.edu/system/files/webform/60959229638.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caec.bin
2e8593571ce455161de4d4ce6a90eb1e17b88986add99cf4be2a6db154c23cf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEC 5544 bytes
font_01_sfnt_off0000ddc6.bin
db8c031cd06a0af4f0e72cc25a43c561ef7edbaf9e8be7fcdd86955ea25efe35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC6 10104 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.