Malicious PDF — malware analysis report

Static analysis result for SHA-256 755c055f8a1243d3…

MALICIOUS

PDF

35.0 KB Created: 2020-04-07 21:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f240c2136b0aef2276f5bbadced29bc3 SHA-1: b5f2cedcae228509b2bcd71104bdb682c6869fbc SHA-256: 755c055f8a1243d32fe89a48a646aaa079dbde72f1c500d12905dc8161b7f02a
94 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains references to 'ibm pax user guide' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious links. The primary attack pattern involves directing users to these external sites, likely for phishing or malware delivery.

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://2por20.com/uploads/1/3/0/2/130289400/130289400.html#ibm+pax+user+guide
    • http://drswanod.com/uploads/1/3/0/5/130541186/4866380.pdf
    • http://okeedan.com/uploads/1/3/0/7/130739346/6372835.pdf
    • http://zeki-turan-sculptor.com/uploads/1/3/0/9/130969236/3669510.pdf
    • http://livingwithmyselfonline.com/uploads/1/3/0/7/130739595/mujodurotisu.pdf
    • http://boxgam.com/uploads/1/3/0/2/130289736/jaramoba_gopajobesopug_gavasexop.pdf
    • http://drjkrohnconsultant.com/uploads/1/3/0/4/130483645/febober_velovirasa_zirudib_sosadaje.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_off00005ebf.bin
885888f8ff03cce3c3965f96b0be40ff28b94e9b17f89d1e81649dcbba92f763		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EBF 8552 bytes

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