Malicious PDF — malware analysis report

Static analysis result for SHA-256 416e78f453a622c4…

MALICIOUS

PDF

72.6 KB Created: 2021-01-15 05:09:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: fc3da17fb8412464d405d79811039ba6 SHA-1: b2008ba46d1003339360cac53628532976152aa5 SHA-256: 416e78f453a622c4c4bccb07ec8c028f43b5bcc503ba9863a830023983fa30a4
126 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a link farm on disposable hosting, with a high ML score and ClamAV detection confirming maliciousness. The embedded URL points to a site that appears to be a lure for Joomla template installation, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest it is designed to redirect the user to a malicious external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffset.ru/aws?utm_term=joomla+3.+x+templates+installieren PDF link annotation
    • https://site-1194826.mozfiles.com/files/1194826/80035486822.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419441/normal_5fa7e7693c609.pdfIn PDF document text
    • https://zubawolovef.weebly.com/uploads/1/3/4/4/134481331/6766015.pdfIn PDF document text
    • https://site-1173205.mozfiles.com/files/1173205/rimowako.pdfIn PDF document text
    • https://site-1167953.mozfiles.com/files/1167953/jasewikotakaxodezaro.pdfIn PDF document text
    • https://site-1180442.mozfiles.com/files/1180442/switched_at_birth_season_1_episode_4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366964/normal_5faea3cb8b6ad.pdfIn PDF document text
    • https://cdn.sqhk.co/xovatapegil/cV3Elgj/netizut.pdfIn PDF document text
    • https://site-1168326.mozfiles.com/files/1168326/pig_and_friends_jump_hay_stack_jumper.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gitipelut/stella_glow_ending_guide.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_off0000def3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF3 5216 bytes
SHA-256: c4d47506cdda15b02df56c4c386beec34034e1bde9122312d26a9205c1853e75
font_01_sfnt_off0000f0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 10828 bytes
SHA-256: 58acb8df22483c5413c5d8a52814fc72618e9d7a806bfbcea6520d9e9dca4200

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