Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6594282d2309eb1…

MALICIOUS

PDF

68.8 KB Created: 2021-04-11 11:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3169cd1d5baea4af25fe26c0ae03e9a7 SHA-1: 1ae7d80e413cf2760d53c377c0361f3c377df6d3 SHA-256: a6594282d2309eb1bc44eec19197459001a69150ea00c407419bdf8d7a09535f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs, one of which is a known benign feed but others are unknown or potentially malicious. The presence of embedded URLs and the PDF's structure suggest it is designed to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://architecturaldesigninc.com/sites/default/files/56675633315.pdf In PDF document text
    • https://www.blplegal.com/sites/default/files/webform/80507347088.pdfIn PDF document text
    • https://ambrose.edu/sites/default/files/webform/lajeriz.pdfIn PDF document text
    • http://www.pbttphtk.gov.my/sites/default/files/webform/33269367294.pdfIn PDF document text
    • http://cicatsalud.com/html/sites/default/files/webform/99284441703.pdfIn PDF document text
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/16831560309.pdfIn PDF document text
    • https://www.ofalloncasting.com/sites/default/files/webform/34904816646.pdfIn PDF document text
    • https://www.natsihwa.org.au/sites/default/files/webform/25680057182.pdfIn PDF document text
    • https://ambrose.edu/sites/default/files/webform/9027254294.pdfIn PDF document text
    • http://oaklandchildcare.org/sites/default/files/webform/41266633523.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=we+become+what+we+behold+2PDF link annotation
    • https://minorsoncampus.princeton.edu/system/files/webform/janoruzafasolefixos.pdfIn PDF document text
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/72323592377.pdfIn PDF document text
    • https://drones.princeton.edu/system/files/webform/66931006591.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF12 5280 bytes
SHA-256: 161ce5a033a9b7a7c908b0687220a35e4b9d2398e0779eb231bb8017739715b2
font_01_sfnt_off0000e0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F8 10472 bytes
SHA-256: d050237c8e62d0a966c5aef82a76243e3c8af4fbc1ed617e63eca36c885e573d

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