Malicious PDF — malware analysis report

Static analysis result for SHA-256 0507a386ed513d89…

MALICIOUS

PDF

37.6 KB Created: 2020-06-14 20:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ec371fdea7642e37105c022deb5ffeb SHA-1: ba12893ab13f508150e9ad4eb471eedc942376c1 SHA-256: 0507a386ed513d8948fd2bf7a740226bb9c331ff47dfe0d369dcd7f45390c390
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by multiple engines, including ClamAV and an ML classifier. It contains a large number of embedded external links, many of which point to other PDF files with numeric slugs, suggesting a link farm or SEO manipulation tactic. The document body, though partially corrupted, contains references to 'tax valuation guide' and the wkhtmltopdf application, indicating a potential lure. The presence of embedded URLs and the nature of the link farm suggest the document is intended to redirect users to potentially malicious content or facilitate further compromise.

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-8704857-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8704857-0
  • 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://claudiamoorehealing.com/uploads/1/3/0/6/130603822/130603822.html#tax+valuation+guide
    • http://juleslouis.com/uploads/1/3/0/7/130739206/1484509.pdf
    • http://navreasset.com/uploads/1/3/1/3/131398176/lipanisijomige-tukewot.pdf
    • http://huiwangfinance.com/uploads/1/3/0/3/130323908/9966844.pdf
    • http://calebcarmichael.com/uploads/1/3/1/4/131483550/lezorubaxufe-zozifekogiro-wivojexoset.pdf
    • http://hoopindex.net/uploads/1/3/0/7/130776611/rejimikoguw.pdf
    • http://foundationclosing.com/uploads/1/3/1/6/131607066/xonugilefidiral.pdf
    • http://andyrosenberg.com/uploads/1/3/1/3/131381901/sofolafag.pdf
    • http://christinabeautyparlour.com/uploads/1/3/0/7/130739315/13453c2f3af551d.pdf
    • http://redbricklc.com/uploads/1/3/1/4/131406821/fc243a72a688.pdf
    • http://fatrootllc.com/uploads/1/3/0/7/130739202/1565804.pdf
    • http://mta-sts.mail.v2rventuresllc.com/uploads/1/3/1/3/131398145/1506686.pdf
    • http://utmeddig.se/uploads/1/3/1/0/131070116/5207909.pdf
    • http://wellnessreclamation.com/uploads/1/3/1/8/131871614/vawabagaxamaje.pdf
    • http://moneyfornothin.net/uploads/1/3/0/4/130436139/2a027425e856584.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://wabufalij.files.wordpress.com/2020/06/bavukiw.pdf
    • https://vozedut.files.wordpress.com/2020/06/74696097913.pdf
    • https://xexinemi.files.wordpress.com/2020/06/96578429561.pdf
    • https://wemowuj.files.wordpress.com/2020/06/sotuxan.pdf
    • https://navofifur.files.wordpress.com/2020/06/kotamepijibozalobe.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006554.bin
42890419d8dcbef0a5c3af74b261cb1d1568d50b95dc0295a46d5218efa400cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6554 10980 bytes

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