Malicious PDF — malware analysis report

Static analysis result for SHA-256 439a44f4473197b2…

MALICIOUS

PDF

66.8 KB Created: 2020-11-24 22:43:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4603815af602cff2237cbb8b6e088fc SHA-1: d79d67f87eda2d0cf099296a4998143b9cc3b6d5 SHA-256: 439a44f4473197b2e726b93175f374450b5a44c8db0ee07c4822d1900eb059be
214 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, and it contains numerous embedded URLs. One critical heuristic indicates the PDF links to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. The presence of a large link farm further supports this, with many links pointing to external PDF files, likely part of a campaign to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/strik?utm_term=elegoo+uno+r3+tutorial
    • https://cdn-cms.f-static.net/uploads/4485445/normal_5fb7b16feaaeb.pdf
    • https://cdn-cms.f-static.net/uploads/4450156/normal_5fada3625b4d8.pdf
    • https://fiwugoxatalaj.weebly.com/uploads/1/3/4/4/134498599/40d1a8.pdf
    • https://cdn-cms.f-static.net/uploads/4366324/normal_5f8761f8a411f.pdf
    • https://vorabatuzawudun.weebly.com/uploads/1/3/4/5/134582038/4030194.pdf
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5f91adeccf228.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bubisifapagefe/fluval_306_gph.pdf
    • https://s3.amazonaws.com/jotizifime/convert_to_editable_word_zamzar.pdf
    • https://s3.amazonaws.com/zuxime/72191862849.pdf
    • https://s3.amazonaws.com/sezebepit/xarosirejeriweri.pdf
    • https://s3.amazonaws.com/zunaporam/xidaposuxuronikuzopomakaz.pdf
    • https://s3.amazonaws.com/mesixadelomomo/rutalupikexofaxakataj.pdf
    • 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_off0000caa2.bin
07ac67c041486b65f188243770de6b873c4d725b68329a3f2bf7b147cc58b63b
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA2 4796 bytes
font_01_sfnt_off0000db08.bin
20945894f788fab42902bf21632ee249a5de9b109ba43195dde3d9552f25dd69
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB08 10572 bytes