Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d59d7a3eb9546e3…

MALICIOUS

PDF

39.3 KB Created: 2020-03-21 18:41:40 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fe6f2ea31840999dec3c52ab90d91c90 SHA-1: ab70c9aaeb5c4d8c4bb2fd359f0ff675bfbdcefa SHA-256: 6d59d7a3eb9546e366286383f439f213f335e1b7afce1f7ec8cb4c4bb4c339c2
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The embedded URLs likely lead to further malicious content or phishing pages, and the document body contains obfuscated text that includes some of these URLs, indicating an attempt to disguise the malicious intent.

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://yaredimmtratax.com/uploads/1/3/0/7/130740625/130740625.html#android+programming+the+big+nerd+ranch+guide+4th+edition+source+code
    • http://cyklr.com/uploads/1/3/0/8/130874289/gonuzasoregizir.pdf
    • http://aomenwangshangtaiyangchengdubo.br3h.com/uploads/1/3/0/6/130621515/7426485.pdf
    • http://machinelearningstocks.com/uploads/1/3/0/7/130776805/95b6ec1f3611.pdf
    • http://hostmaster.globalip-intel.com/uploads/1/3/0/3/130379051/5737778.pdf
    • http://gospelattherock.org/uploads/1/3/0/3/130313718/xiwixawufivava.pdf
    • http://belserenterprise.com/uploads/1/3/0/4/130483806/zalaketanetoligibafe.pdf
    • http://breadandbuttertogo.com/uploads/1/3/0/3/130379158/febivodofege.pdf
    • http://mail.thespiritbutterfly.com/uploads/1/3/0/2/130289564/9647116.pdf
    • http://churchilltailors.com/uploads/1/3/0/6/130639452/bewisujozitewi-rudedaj.pdf
    • http://www.responsibleskiing.com/uploads/1/3/0/7/130776719/wumef-sumof-mowufobarupizit-sitat.pdf
    • http://norecordsnobs.com/uploads/1/3/0/5/130542934/3542052.pdf
    • http://apslabgroup.com/uploads/1/3/0/7/130775357/7627494.pdf
    • http://tecnicasdesanacionenergetica.com/uploads/1/3/0/4/130483684/f1d890bfc55f.pdf
    • http://www.online365.org/uploads/1/3/0/6/130604541/43c7ae0c19c6.pdf
    • http://groupe-uniti.com/uploads/1/3/0/5/130551957/1978301.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_off00006c33.bin
c7abf492c9e77d505f7618a56c649a5690907e3d92366470552049b794182247		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C33 8620 bytes

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