Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b12bfa2a72405f2…

MALICIOUS

PDF

32.3 KB Created: 2020-06-16 05:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c36b19e1c093362021cae9c54bf03b0 SHA-1: bf7a418e5dfc41959a097da05b69f6b7c026c876 SHA-256: 1b12bfa2a72405f2763d840b53c018be86929bbc258368e8d3b550fcbd6debff
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, characteristic of a link farm or SEO poisoning attack. The document body, though heavily obfuscated, contains references to 'Haynes manual discovery' and the authoring application 'wkhtmltopdf', suggesting a lure to external content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URLs indicates an attempt to redirect the user to potentially malicious sites.

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://guelcreations.com/uploads/1/3/0/6/130621686/130621686.html#haynes+manual+discovery
    • http://breonydelforce.com/uploads/1/3/1/0/131071184/witijusekeduwaka.pdf
    • http://enhancedlookstudio.com/uploads/1/3/0/6/130620987/4485767.pdf
    • http://ohneissues.com/uploads/1/3/0/7/130739830/jesupume_pipetilu.pdf
    • http://theonlychildnetwork.com/uploads/1/3/0/9/130969905/8228785.pdf
    • http://designbykev.com/uploads/1/3/1/4/131407263/530e1cf164ef662.pdf
    • http://archivedrmlyc3rhcmfkztiwmtluvgg.heartchristianacademy.org/uploads/1/3/0/6/130639665/juxefer-xibinud-puxebanimove.pdf
    • http://resonateheaven.com/uploads/1/3/0/6/130605097/mudonagujadipow.pdf
    • http://yonatan999.octarinesec.com/uploads/1/3/0/4/130488498/pigukiwefigeti.pdf
    • http://melbournehotel.devsite-1.com/uploads/1/3/0/5/130541765/dakowogenem.pdf
    • http://smtp1.stmaryschoolchardon.org/uploads/1/3/0/2/130289721/1236586.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_off0000526b.bin
8948685798e14f2a30ac0461b823d3757d899cc619cd380a4aa682887da87b8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x526B 10452 bytes

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