Malicious PDF — malware analysis report

Static analysis result for SHA-256 37013455e25eb108…

MALICIOUS

PDF

33.2 KB Created: 2020-06-07 05:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d57add5acaac50e6f73e45d6f1764a0c SHA-1: 1d0f0e4cba5ee7b58dc14637efad888fc0ac854a SHA-256: 37013455e25eb1080d735d72f14ebcf88467b1d068ea220dc0243fa022c6a47d
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, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains references to URLs that are part of this link farm. The primary attack pattern appears to be the creation of a link farm to distribute or obscure malicious content across numerous domains.

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://twincitieselectricmn.com/uploads/1/3/1/8/131871871/131871871.html#artificial+brain+pdf
    • http://brandywinevalleytrail.com/uploads/1/3/0/6/130620737/penut.pdf
    • http://jingying.bpmtc.com/uploads/1/3/1/6/131607919/belotoxelupozu.pdf
    • http://nsr10313.com/uploads/1/3/0/7/130775949/zoled.pdf
    • http://aquaticswithmermaidjenna.com/uploads/1/3/1/4/131407235/vurusikawamuvuloran.pdf
    • http://hostmaster.jakejarvi.com/uploads/1/3/0/8/130814785/tewivojogudidejet.pdf
    • http://barryconstructionremodeling.trustabiz.com/uploads/1/3/0/7/130739887/837c7.pdf
    • https://nitufomujame.files.wordpress.com/2020/06/23798413800.pdf
    • https://zufiwupaned.files.wordpress.com/2020/06/46402007279.pdf
    • https://bogosakodulo.files.wordpress.com/2020/06/89313356280.pdf
    • https://nomukobopu.files.wordpress.com/2020/06/zozifupolivozezijotu.pdf
    • https://ponusufos.files.wordpress.com/2020/06/kilinob.pdf
    • https://pemaguw.files.wordpress.com/2020/06/25820974606.pdf
    • https://fijurabowo.files.wordpress.com/2020/06/zajelokegisajemazeg.pdf
    • https://metazak.files.wordpress.com/2020/06/38776641532.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_off00005531.bin
95db0eeaaf062a0d9eca2de3fe1445b08336c073bf3097c189fa6b7abe8420ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5531 10660 bytes

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