Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf51bbf730deb992…

MALICIOUS

PDF

33.9 KB Created: 2020-04-08 22:39:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b5ec79cb513f15f75c39d98a72f4dc20 SHA-1: fe83ef7e4753235844a2e33af157bfb00dfc066a SHA-256: bf51bbf730deb99275d5a17ad0b4c8dc169f303c6924ea6c4bac866b2807643e
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many with numeric or generic slugs, indicative of a link farm or SEO poisoning tactic. The primary heuristic firing, PDF_SEO_LINK_FARM, confirms this behavior. The embedded URLs are likely used to redirect users to malicious sites or phishing pages. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://crossingairways.com/uploads/1/3/0/5/130538863/130538863.html#netgear+powerline+av+200+adapter+xav2001
    • http://lnphotography.org/uploads/1/3/0/6/130639641/detexibalafajepised.pdf
    • http://peyerpianostudio.com/uploads/1/3/0/7/130776205/2128014.pdf
    • http://doquangchau.com/uploads/1/3/0/2/130271201/8525771.pdf
    • http://storygems.co/uploads/1/3/0/2/130270885/xevogak.pdf
    • http://cardinalrealtyllc.com/uploads/1/3/0/5/130541346/5516b10.pdf
    • http://teesarewild.com/uploads/1/3/0/7/130776106/dowuxokaka-supusivazadopap-rifeduvigan.pdf
    • http://cascadiagreens.us/uploads/1/3/0/4/130489029/givuririkerupa-dimuxaz-belupimoniwu.pdf
    • http://worldsoccerblogging.com/uploads/1/3/0/4/130435929/wevaxukezo.pdf
    • http://lemonadecandlebar.com/uploads/1/3/0/6/130639651/bowuluka-gafakonib.pdf
    • http://themixingbowlboise.com/uploads/1/3/1/3/131398444/nezadosisif.pdf
    • http://raediantevents.com/uploads/1/3/0/3/130379295/938163.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_off00005e15.bin
13f32a56398b2d82cda5be03ccba9bcf26bdc9d84dc6a903da22a82c1d0e38ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E15 7260 bytes

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