Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd844fd4aa81775…

MALICIOUS

PDF

46.3 KB Created: 2020-03-15 09:08:40 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f1c3f8e2843d66bdbf82e4c54487bb49 SHA-1: 1956372089dd5019d709f1125defd38f8b48e701 SHA-256: 6fd844fd4aa817755653a379727ded323196bf0da8e200c9eda7c629f19b5b13
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the embedded links points towards a malicious document, likely intended to redirect users to potentially harmful websites or distribute further malware.

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://amber-cano.rominastiebenphotography.com/uploads/1/3/0/8/130813514/130813514.html#best+air+fryer+toaster+oven+consumer+reports
    • http://sawyerboone.com/uploads/1/3/0/2/130272291/sovovawupuxa-fonaxanoziv-ruxumesuna-zedifoxo.pdf
    • http://rsllcw.com/uploads/1/3/0/2/130289618/tosuvidolizef.pdf
    • http://kngjames.com/uploads/1/3/0/4/130483539/f66c218.pdf
    • http://polishedpad.com/uploads/1/3/0/7/130775134/sonun.pdf
    • http://lesliemendez.com/uploads/1/3/0/2/130274304/59c31fb91f23.pdf
    • http://www.weddingcarsofsydney.com.au/uploads/1/3/0/2/130289236/75c13480.pdf
    • http://www.aquaservant.com/uploads/1/3/0/5/130590719/soborugumevoz.pdf
    • http://postmaster.fietsverhuurardennen.be/uploads/1/3/0/5/130588940/jirarugeto.pdf
    • http://www.thegallerydifferent.com/uploads/1/3/0/5/130546434/mogamogefu.pdf
    • http://www.chrisantonisonphotography.com/uploads/1/3/0/5/130590241/5cee1b6b.pdf
    • http://abetterwaytobreathe.com/uploads/1/3/0/6/130621707/1700b6782.pdf
    • http://www.alainkouo.com/uploads/1/3/0/4/130488199/147654a2bd6478.pdf
    • http://www.stalvanmourik.com/uploads/1/3/0/5/130588500/piparaf.pdf
    • http://www.lucyserrands.com/uploads/1/3/0/9/130969214/8874617.pdf
    • http://norvelfinancialsolutions.com/uploads/1/3/0/3/130323717/1e9b7949d7ca8f.pdf
    • http://www.ninthvision.com/uploads/1/3/0/4/130483050/bamuso_mozotuwox_zozemo_zijatomodogudo.pdf
    • http://harrypottergoestoschool.com/uploads/1/3/0/5/130550731/fagefubixo.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_off000087d4.bin
10d493126d8e892d38a0164075a722150ac2049b1ef9c6e4472a8cdfc3224c2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87D4 9128 bytes

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