Malicious PDF — malware analysis report

Static analysis result for SHA-256 627449064183b744…

MALICIOUS

PDF

40.1 KB Created: 2020-04-07 14:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bcba1d6f0d3ab28a6a1e8aadb471db82 SHA-1: 321f271c09d7772c4a065211b5c9a42dec77e17f SHA-256: 627449064183b744bfba20512e5c3f9fa4eb33381375118d9acc2e4e36e44d6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a dropper. The document contains a large number of external links to PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic to distribute further malicious content. The primary goal appears to be redirecting users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.Dropper.Agent-8166393-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8166393-0
  • 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 http://jennamccabe.com/uploads/1/3/1/4/131453805/131453805.html#etapas+de+la+divisi%C3%B3n+celular+mitosis
    • http://kenbrookgo.com/uploads/1/3/1/3/131381166/2621953.pdf
    • http://coachsupervisiongroups.com/uploads/1/3/1/3/131379808/kojoxapizeko.pdf
    • http://liamcdairygoats.com/uploads/1/3/1/4/131406982/6726042.pdf
    • http://patriots4america.com/uploads/1/3/0/3/130379192/vefuji.pdf
    • http://meggilectric.com/uploads/1/3/0/4/130483345/rejatodu_repajelapuro_sumefukunu.pdf
    • http://app-access.de/uploads/1/3/0/6/130621020/3a997ec.pdf
    • http://9roundmemphis.com/uploads/1/3/0/5/130538842/ec33b401.pdf
    • http://drazenbuntic.com/uploads/1/3/0/7/130776358/8852300.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000723c.bin
d9bbe33e49936f7776994b4131719c1c27101298636899d8e792085e4d3ee46b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x723C 8556 bytes

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