Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc88ecbd9a5a8294…

MALICIOUS

PDF

36.1 KB Created: 2020-06-11 18:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6b56593c7d4420e32dc1d0cb1bc566f SHA-1: 011c1d68e7c26b09dc8aad041ed4fbefbc91c08a SHA-256: cc88ecbd9a5a829478c2f9e66908628d80582898e17fb69b4c9dfb982a527383
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, a technique often used for SEO poisoning or to distribute malware. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the sheer volume of external links and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest a malicious intent to redirect users to potentially harmful 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://webdisk.collegedemsatiu.com/uploads/1/3/1/4/131408056/131408056.html#bully+math+class+5+answers
    • http://caitlincisco.com/uploads/1/3/0/6/130604449/mulekurisiwora.pdf
    • http://njfmanwithvan.co.uk/uploads/1/3/0/2/130287445/2436434.pdf
    • http://diabetescalgary.ca/uploads/1/3/2/3/132302794/8206283.pdf
    • http://amazingjourneyfoundation.us/uploads/1/3/1/4/131438211/c8ca36df9.pdf
    • http://mail.eventsbynicole.net/uploads/1/3/0/4/130488197/wesenexagivavisoru.pdf
    • http://seatdrop.org/uploads/1/3/0/4/130436162/benog_befipajumasu.pdf
    • http://dynamiteseafood.com/uploads/1/3/0/5/130540046/7945669.pdf
    • http://mta.safehavenworship.com/uploads/1/3/0/7/130740492/kuxavanu-kijunezavo-zifab.pdf
    • http://webmail.solventio.com/uploads/1/3/0/4/130476385/1666439.pdf
    • http://dvremodel.com/uploads/1/3/0/5/130588509/futopejolosilef.pdf
    • https://woxedafirewe.files.wordpress.com/2020/06/90286975309.pdf
    • https://lavesuv.files.wordpress.com/2020/06/remakobofeburudanikoz.pdf
    • https://zuterejesami.files.wordpress.com/2020/06/61967529000.pdf
    • https://noratum.files.wordpress.com/2020/06/firun.pdf
    • https://jerurig.files.wordpress.com/2020/06/buzuxof.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_off00005e38.bin
93dd703e3b8067be3ae0d366f7319c6f26db167906d3373064cf90aff9f491e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E38 11268 bytes

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