Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a6bb58a31ad8c48…

MALICIOUS

PDF

45.1 KB Created: 2020-03-30 02:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7569ea1e5588134f598409103a39a33e SHA-1: 6c61d2e0a876bf2fb1ffd852f6bc0074469907d3 SHA-256: 0a6bb58a31ad8c4800e9634e555fd96e99f0ca743bae53fb2d83c53c34b01d6e
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely as a dropper. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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-8082619-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8082619-0
  • 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://hall-elopement.rominastiebenphotography.com/uploads/1/3/1/3/131379971/131379971.html#define+amnesia+y+explique+la+diferencia+entre+amnesia+retrograda+y+amnesia+anter%C3%B3grada
    • http://nfldraftdays.com/uploads/1/3/0/6/130639147/pabetiv.pdf
    • http://burnett-farms.com/uploads/1/3/0/5/130551457/mevavaroba-neguxesute.pdf
    • http://customfitstop.com/uploads/1/3/0/6/130639839/totejujodepa-sefifuw.pdf
    • http://disastersupply.org/uploads/1/3/1/1/131164250/19b031.pdf
    • http://aircontrolexperts.com/uploads/1/3/1/3/131380612/kegikonimi.pdf
    • http://thewindingsheetoutfit.org/uploads/1/3/1/3/131384599/249860.pdf
    • http://heavenlyinhomecare.com/uploads/1/3/0/2/130289734/dedamadu_jotifatadij.pdf
    • http://americanidiomsforeslstudents.com/uploads/1/3/0/5/130539658/c1370948cb6c3d.pdf
    • http://the-ship-app.com/uploads/1/3/0/6/130604079/vexeteguzikexezifopu.pdf
    • http://amministrazionidicondominio.com/uploads/1/3/0/9/130969184/9713556.pdf
    • http://paulrogge.com/uploads/1/3/0/9/130969360/palediso_tititodaj_govisifav.pdf
    • http://hullabaloo-sweets-party-supplies.com/uploads/1/3/0/5/130588977/5107a3f8c335288.pdf
    • http://usdaum.global/uploads/1/3/0/3/130379305/1354864.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_off000082d3.bin
dbe36379bc87b00da820fef8b862b5a80aeb3c7a62cd75c44e3ad340ec8e35e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82D3 8920 bytes

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