Malicious PDF — malware analysis report

Static analysis result for SHA-256 24da8734d3b87af3…

MALICIOUS

PDF

37.5 KB Created: 2020-03-28 03:11:04 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2b71aa3811f54a8c9e7669ff0a9e88e9 SHA-1: 25038a68a99cf167938e1301637d2fcb464fcf11 SHA-256: 24da8734d3b87af38d79207fa7285e6b7f3d240a32fddea4734f5ae32c503025
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body contains a title related to Catholic prayers, which is likely a lure to disguise the malicious intent of linking to numerous external sites.

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://rachelfleischmann.com/uploads/1/3/0/9/130969498/130969498.html#oraciones+catolicas+en+tiempo+de+cuaresma
    • http://www.minniecrockwell.com/uploads/1/3/0/5/130590577/7370145.pdf
    • http://martabarandiy.com/uploads/1/3/1/0/131070895/sakowag.pdf
    • http://bluchipfreeview.com/uploads/1/3/0/8/130874437/wefod-pifapuzomevod-loxogivonajokat-gelajizewo.pdf
    • http://dhiyohstudio.com/uploads/1/3/0/4/130478314/lugadebefoki.pdf
    • http://rentatek.net/uploads/1/3/0/4/130476940/ludukef.pdf
    • http://mta-sts.mail.pilatesante.com/uploads/1/3/0/5/130551072/vefepazigo.pdf
    • http://e1shipperpro.com/uploads/1/3/0/6/130639343/f32102.pdf
    • http://www.ambivalent-corp.com/uploads/1/3/0/4/130483070/8945316.pdf
    • http://ashevillelimoservice.net/uploads/1/3/0/4/130476157/45315a99b1177.pdf
    • http://mirageestates.com/uploads/1/3/0/3/130323328/4422498.pdf
    • http://xycomb.com/uploads/1/3/0/4/130435929/130e7.pdf
    • http://woodmtbedandbreakfast.com/uploads/1/3/0/7/130775339/1348486.pdf
    • http://jblandscapeservices.com/uploads/1/3/0/6/130640024/zewofulukerum_wudumawedov.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_off0000686b.bin
2c41a7f7ff90ae82cb59c1adb5e37c47d51c9923a09b74dcf34feba91ee3dee4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x686B 8548 bytes

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