Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a86e25309a0c30…

MALICIOUS

PDF

40.6 KB Created: 2020-05-05 01:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 11f5f0fa1fef61cfa9f79912c475553f SHA-1: 076d00dea2c59d3096ab1bace77d40ac95d8412f SHA-256: 18a86e25309a0c3033c76b5af196b2061600b540d614d4a08f3e9e5e7b0d7843
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded links likely serve to distribute malicious content or manipulate search engine results, suggesting a link distribution or SEO poisoning attack pattern. No scripts were extracted from this sample.

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://keatingphysicaltherapy.net/uploads/1/3/0/6/130621431/130621431.html#3ds+roms+cia+format
    • http://elevationchristiancenter.com/uploads/1/3/0/7/130738814/goxenufot.pdf
    • http://horlogeverkoopwereld.nl/uploads/1/3/1/6/131637841/9812016.pdf
    • http://legendsinmusicpedia.com/uploads/1/3/0/7/130739712/1cecaadf35c4212.pdf
    • http://cardiffsymphonicwinds.com/uploads/1/3/0/2/130288562/setodebeje.pdf
    • http://biggerbubble.us/uploads/1/3/1/4/131438268/a6b62991d3271a6.pdf
    • http://smart-grass-ohio.com/uploads/1/3/1/0/131070559/xijutumanuxi.pdf
    • http://annaferrissimpson.com/uploads/1/3/0/4/130478314/7509598.pdf
    • http://productionriggingdepartment.com/uploads/1/3/0/7/130740149/wewunafosixoxi.pdf
    • http://2791lawtoncourt.com/uploads/1/3/0/8/130873818/e103b4e18078e.pdf
    • http://cuisineofangels.com/uploads/1/3/0/7/130739740/jiwefetasa.pdf
    • http://flitecluboc.com/uploads/1/3/0/6/130621926/visosepupijafam.pdf
    • http://litrashremoval.com/uploads/1/3/0/7/130775405/60e045c31cf9.pdf
    • http://knightsencsd.com/uploads/1/3/0/6/130604366/dba140ebaee8.pdf
    • http://majonesdesign.com/uploads/1/3/0/5/130588810/rozonalog-tamogugopa-fogevula-vevogapoxusu.pdf
    • http://bunkjohnsonbrazzband.com/uploads/1/3/0/6/130639852/tegenim_memepu_regunanado_rawapule.pdf
    • http://ariel4you.com/uploads/1/3/0/6/130621896/4136033.pdf
    • http://donsmarketemmett.com/uploads/1/3/1/4/131407511/faxivizegukel-sanororuvamumib-kupiroriximep-fududumukawaka.pdf
    • http://gicdigitalmarketing.net/uploads/1/3/0/3/130379506/578167.pdf
    • http://lab215spitta.net/uploads/1/3/1/3/131379211/7db11ce2c24.pdf
    • http://bayareadivorcemidwife.com/uploads/1/3/1/3/131383820/gibukune_nudawevorit_vepuruvozufavul.pdf
    • http://acresofpeach.com/uploads/1/3/0/7/130776590/783f14023.pdf
    • http://streetwiseconsultinggroup.com/uploads/1/3/0/6/130640125/e5f856b.pdf
    • http://hootnanniegame.com/uploads/1/3/0/6/130639962/guresafifinamogekife.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007346.bin
340fa11f229ef7bb59110abdc001505677d7814ca633fe9d0c7c1046c7333026		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7346 10844 bytes

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