Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a773273b197d791…

MALICIOUS

PDF

28.0 KB Created: 2020-05-30 12:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1ebae9ee544064ef62674d76cd58a52 SHA-1: a5e1509e878d90af32cac62debe23639e02992d1 SHA-256: 9a773273b197d7917fd12df2a46f403e7faa7f46d78503ddf05e8853367e7121
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm or a content distribution network for malicious files. The ML classifier strongly flagged this PDF as malicious. The document body contains text that appears to be metadata or truncated content, but the primary malicious activity is the presence of numerous external URLs designed to lure users into downloading more content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://zhajinhuayulecheng.br3h.com/uploads/1/3/1/4/131406239/131406239.html#download+g+eazy+these+things+happen
    • http://smartaleccat.com/uploads/1/3/1/0/131069890/9187053.pdf
    • http://glendalekfss.com/uploads/1/3/0/8/130874642/7995309.pdf
    • http://drkeshiakeith.com/uploads/1/3/1/6/131607683/sovewagutifujagiwov.pdf
    • http://hostmaster.athletetrainingsystems.co.uk/uploads/1/3/0/5/130589399/bevewe_xajibiva_powizaletes.pdf
    • http://emjauto.ca/uploads/1/3/1/1/131163733/8537388.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_off00004626.bin
bae455a20d42ecfb3554b8c6635a0218aac2beee451ec905f8e937e5a1a97284		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4626 9108 bytes

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