Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da46d3b6f3f66fe…

MALICIOUS

PDF

32.4 KB Created: 2020-04-13 11:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 71b5e7c99057b4372d979dd0573d862d SHA-1: d5f29960b870a77acb4a4ad5be2af898035f81b9 SHA-256: 7da46d3b6f3f66fefe4e71c943eacda41fab25def98504a933c9c514135d4dee
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or distribution mechanism. The ML classifier strongly flagged this PDF as malicious. The embedded URLs suggest a spearphishing attachment delivery vector, aiming to redirect users to potentially malicious 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://jameslopezchua.com/uploads/1/3/0/3/130313286/130313286.html#ejercicios+de+progresiones+geometricas+resueltos+paso+a+paso+pdf
    • http://hottubpartssweden.us/uploads/1/3/0/7/130775983/sajurubutilono-kukade-giwemiwoxagim.pdf
    • http://criticalmoments.net/uploads/1/3/1/4/131453119/7721d407a34c.pdf
    • http://nautydoggundogkennels.com/uploads/1/3/0/4/130483492/187f6268649.pdf
    • http://elitepracticepartners.net/uploads/1/3/0/4/130436141/3097966.pdf
    • http://epiphanybykim.com/uploads/1/3/0/3/130312998/5a7395a6c7569.pdf
    • http://swingstatestories.com/uploads/1/3/0/7/130775119/6106793.pdf
    • http://mcmurrians.ca/uploads/1/3/0/4/130490221/deroju.pdf
    • http://bittermelonbook.com/uploads/1/3/0/5/130541624/sowufibitulo.pdf
    • http://wannagotravel.net/uploads/1/3/1/4/131438473/8c1a8d2ba771a.pdf
    • http://toydefenser.com/uploads/1/3/0/6/130604864/nutubiminet-wikadufuboxid-noxik.pdf
    • http://canterburypointe.com/uploads/1/3/0/6/130621682/giduxerifuxetit_xetareku.pdf
    • http://t8fabcenter.com/uploads/1/3/1/4/131406181/lifujivuf-xosojaletad-gunuvaparotar.pdf
    • http://frequencystation.com/uploads/1/3/0/5/130588659/1875101.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_off00005431.bin
0bbd6fbf1543639cefbe38cde6aec4f3fa21f39e57b86a1e552d6bac0abee510		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5431 8256 bytes

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