Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ff2fcf253d6df4…

MALICIOUS

PDF

41.4 KB Created: 2020-03-25 10:27:58 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fb90a7ac7fd055eced6d889663bd2f1c SHA-1: fb4aefd57e76c6d569ebc96de82068e7489e1591 SHA-256: b9ff2fcf253d6df4eaecf11c66f7d37a2d40e116622d764459c8a46964b74214
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted from this sample, limiting the ability to determine specific payload delivery or execution methods.

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://telsaelectricfestival.com/uploads/1/3/1/3/131380236/131380236.html#formulas+de+excel+y+su+sintaxis
    • http://reedcommunicationsllc.org/uploads/1/3/0/6/130639669/masaxelo.pdf
    • http://kbphotographs.net/uploads/1/3/0/9/130969562/dbd08.pdf
    • http://toodue.net/uploads/1/3/0/9/130969496/8829345.pdf
    • http://capitalcommercialpainting.com/uploads/1/3/0/4/130483737/tuzeweno.pdf
    • http://orlaolam.com/uploads/1/3/0/5/130543667/9560621.pdf
    • http://thelaunchpadllc.com/uploads/1/3/0/5/130545278/2971136.pdf
    • http://melonfry.com/uploads/1/3/0/5/130588345/4591815.pdf
    • http://www.dewetter-smith.com/uploads/1/3/0/4/130483566/pumixipukus_nemitorem.pdf
    • http://mta43.somekindofsimple.com/uploads/1/3/0/4/130488749/xumif.pdf
    • http://www.wonderfullymadekitchen.com/uploads/1/3/0/7/130739443/66749ba96ec577c.pdf
    • http://houseofsabbia.com/uploads/1/3/0/7/130775268/dadokanopisuvep.pdf
    • http://constructiondiaries.net/uploads/1/3/0/6/130621180/sutatukibif_vilaxuzin_jexarob.pdf
    • http://yourasheville.com/uploads/1/3/0/5/130589276/bupuxiduvumijobolo.pdf
    • http://more2dance.com/uploads/1/3/0/4/130483638/f89d5b85047c.pdf
    • http://tagrbox.com/uploads/1/3/0/6/130621937/renelavuzelebupo.pdf
    • http://m-lev.net/uploads/1/3/0/8/130814225/862479.pdf
    • http://nicolettamanusardicamicie.com/uploads/1/3/0/4/130435780/kinefoxev-witelikiku-kokefotuw.pdf
    • http://letralevitransfer.com/uploads/1/3/0/2/130270897/f3a4348e9.pdf
    • http://kinoechoes.com/uploads/1/3/0/4/130435755/544e34c7d99ee21.pdf
    • http://kongpheaktra.com/uploads/1/3/0/2/130272102/gazejasugobuli.pdf
    • http://mergny.be/uploads/1/3/0/7/130738786/kujapovu.pdf
    • http://mvm.jensscherb.de/uploads/1/3/0/7/130740458/vofilot.pdf
    • http://www.shop.synergymhs.org/uploads/1/3/0/9/130969588/3020125.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_off0000760e.bin
44231d60cdebd10ed060b54daa5ed0dfd60d32bfe38dedb2b28a0a3bac978df1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x760E 9340 bytes

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