Malicious PDF — malware analysis report

Static analysis result for SHA-256 355c91763ec65dfc…

MALICIOUS

PDF

36.6 KB Created: 2020-04-05 09:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: afc0dff0104d43127dfd2a5d9676a92e SHA-1: 333440e14244199c9c0536861f7891cfdb3fecfd SHA-256: 355c91763ec65dfc5481418311b7e94e42e41303f61c280b897e767a3d63ea77
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files on unrelated domains. This pattern is indicative of a link farm or SEO poisoning technique, likely intended to drive traffic or host malicious content. The ML classifier strongly supports the malicious nature of this PDF. 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://laurenthomerepairs.com/uploads/1/3/1/4/131406234/131406234.html#ds+260+instructions+pdf
    • http://thetresna.com/uploads/1/3/0/3/130379362/212098.pdf
    • http://droneale.com/uploads/1/3/0/6/130604723/9703a.pdf
    • http://blackbirdfarmvt.com/uploads/1/3/0/5/130590375/lofepafafadefuv.pdf
    • http://winebizinc.com/uploads/1/3/0/5/130543262/somoz-nidetawavukir-tikanajabi-koladuwuderi.pdf
    • http://milborneassociates.com/uploads/1/3/0/7/130739509/bajitibabekap.pdf
    • http://citychurchministries.net/uploads/1/3/0/2/130288592/5906239.pdf
    • http://dopechristmas.com/uploads/1/3/0/2/130272509/55d1c.pdf
    • http://leclauzet.com/uploads/1/3/0/4/130477287/vukani.pdf
    • http://dbleagledrones.com/uploads/1/3/0/4/130435787/929040.pdf
    • http://isabellekler.org/uploads/1/3/0/2/130272424/dujowojazomam.pdf
    • http://ipray4u-intl.org/uploads/1/3/0/5/130588714/bdf8b9af60b.pdf
    • http://chesterandoscar.com/uploads/1/3/0/5/130551558/remadogixure_ruzila_jinejotawurilin.pdf
    • http://mansionsiemreap.com/uploads/1/3/0/9/130969459/42bff4.pdf
    • http://forestfueles.com/uploads/1/3/0/5/130541000/giviwebikigosot.pdf
    • http://mrt-konsult.com/uploads/1/3/0/2/130287939/fesafotefoz.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_off0000668c.bin
a85d58716949a1f76ea12f81dcb9a313734987fcaca405ab9aa1c772214624d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x668C 8124 bytes

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