Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9431d6ee23a562…

MALICIOUS

PDF

76.1 KB Created: 2021-04-21 02:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9cb2ced7ba37c3b1ba6704469e194aa SHA-1: 5f20cecfc352d186792a0ce2b935da403c13ab32 SHA-256: bc9431d6ee23a56283743f32e11f7537367bbe3fd2dd7b11013e8ee6e4292451
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a phishing or credential harvesting campaign. The presence of an external URI heuristic further supports the attack pattern of directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ambrose.edu/sites/default/files/webform/rebunedirewe.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/238550972.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/43403042061.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/10654010608.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/7486912807.pdf
    • https://www.a1touchsolution.nl/sites/default/files/95216779236.pdf
    • https://www.blplegal.com/sites/default/files/webform/89971565628.pdf
    • https://www.termis.org/system/files/webform/98565071062.pdf
    • https://www.cdcplumbing.com/sites/default/files/webform/contact-us/65589142167.pdf
    • https://www.afscme65.org/system/files/webform/11173368180.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=asus+z97-a+bios+chip
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ece4.bin
7987eaeadb8df469b2768a39d7250e7233b8ab83f7e76ac050be5b67af24b197		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 5340 bytes
font_01_sfnt_off0000ff1f.bin
85b772327f2571c5efbf8e05ce9774dc89328071c2756939474fb17bfc958ec2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1F 10920 bytes

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