Malicious PDF — malware analysis report

Static analysis result for SHA-256 594517652fbb91f6…

MALICIOUS

PDF

48.4 KB Created: 2020-04-12 23:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: db52ecfa3f43be13e5b3eff46ba830b5 SHA-1: e8f5f2b4a833a50cb13bb086f3e9d12d7db8ad55 SHA-256: 594517652fbb91f619e3795f59f12132c374789e4512805de3cf774b4a0ac7a4
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF files on different domains. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern appears to be the creation of a link farm, potentially for SEO manipulation or to distribute further malicious content through the linked PDFs. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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://marconettzoo.com/uploads/1/3/0/4/130488914/130488914.html#10+palabras+de+familia+en+ingles
    • http://reliccellars.com/uploads/1/3/0/9/130969475/6663852.pdf
    • http://crafts-by-nancy.shop/uploads/1/3/0/5/130541402/1570ba21bf.pdf
    • http://dbergstrom.com/uploads/1/3/0/2/130270889/zimizi.pdf
    • http://donovantile.com/uploads/1/3/0/4/130483923/8846061.pdf
    • http://gbwtrading.com/uploads/1/3/0/8/130814279/8063388.pdf
    • http://oliviaorafashiondesign.com/uploads/1/3/1/4/131483053/3162987.pdf
    • http://katelangridge.com/uploads/1/3/0/6/130604756/turaxelujosazi.pdf
    • http://boswellfitness.com/uploads/1/3/0/6/130604801/julalad.pdf
    • http://bloomingtonlawncareservices.com/uploads/1/3/0/4/130488312/senofawibetot_tofapugu.pdf
    • http://solutionscleaning.services/uploads/1/3/0/9/130969298/mibeluwus.pdf
    • http://warpigs-mc.com/uploads/1/3/0/6/130620868/54d3f8.pdf
    • http://moxieme.net/uploads/1/3/0/6/130621751/145996.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_off0000924d.bin
81d2ccaafc7c1d408ef9d101aa40ff90b2180e1f51ace1089de8db511e833000		 pdf-font-stream PDF embedded font (sfnt) at offset 0x924D 9252 bytes

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