Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f0b7ab17a4f883…

MALICIOUS

PDF

44.0 KB Created: 2020-04-01 19:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3702b7d24cb913adc4398da9df5cd433 SHA-1: 221cda4d7081208572fa959c58f4bd5630c4b93f SHA-256: c9f0b7ab17a4f8839940dd8fc156ef13fab0c363d04c922896c0236e9e578b3c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links to other PDF files hosted across numerous domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded document body text, though garbled, contains a URL that matches one of the extracted links, suggesting an attempt to direct users to potentially malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://cassiusmaintenance.com/uploads/1/3/1/3/131382113/131382113.html#tag+heuer+aquaracer+review+quartz
    • http://sarahwk.com/uploads/1/3/0/7/130740133/2157885.pdf
    • http://lansdownewritersworkshop.com/uploads/1/3/1/3/131398472/donupijixitumomamodo.pdf
    • http://harnesshorses.org/uploads/1/3/1/1/131163634/vitawita.pdf
    • http://ukkore.com/uploads/1/3/0/4/130435547/b6d01f349f.pdf
    • http://cro-consulting.com/uploads/1/3/0/7/130739490/e78ce0751.pdf
    • http://learnshareact.net/uploads/1/3/0/7/130740524/5351450.pdf
    • http://ricefamilyfarms.com/uploads/1/3/0/5/130590117/wumaku-xakikodam-xevoxodifi-bekabage.pdf
    • http://paintintothenite.com/uploads/1/3/1/1/131163960/3692530.pdf
    • http://cookiedoughmagiccatering.com/uploads/1/3/0/8/130814393/koxiseto.pdf
    • http://atxpez.com/uploads/1/3/0/8/130814186/jobokam_gozewowuf.pdf
    • http://takemeals.com/uploads/1/3/0/4/130436050/3435936.pdf
    • http://luxurylimocda.com/uploads/1/3/1/0/131070979/lakodagul_mifatopuzim.pdf
    • http://shopthetackshack.com/uploads/1/3/0/4/130483911/bd2511c44.pdf
    • http://www.applesandbooks.com/uploads/1/3/1/4/131408620/fda66.pdf
    • http://truittray.com/uploads/1/3/0/5/130547142/8762218.pdf
    • http://mandmfinancing.org/uploads/1/3/0/7/130776739/3873829.pdf
    • http://blogfoodsby.com/uploads/1/3/1/0/131070231/dotatewawubibusuvip.pdf
    • http://tanyaszommer.net/uploads/1/3/0/9/130969373/nalagubugaz.pdf
    • http://havinetvzw.com/uploads/1/3/0/5/130588502/retanexutusapufebi.pdf
    • http://charismacoronado.com/uploads/1/3/0/9/130969424/f936b6.pdf
    • http://southertonjewelry.com/uploads/1/3/0/6/130640059/543190.pdf
    • http://natalie-bee.com/uploads/1/3/0/7/130738623/judisasu.pdf
    • http://webdisk.news.soupinto.com/uploads/1/3/0/7/130776555/5872660.pdf
    • http://mtbrewtours.com/uploads/1/3/0/5/130539004/b8551c31b77e774.pdf
    • http://awningcareplus.com/uploads/1/3/0/5/130551461/desokatoz.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_off000081be.bin
0dcf64d494913cffbe284cd2196a31b691bd8137ce86d5771b44b3e819ced85f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81BE 8464 bytes

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