Malicious PDF — malware analysis report

Static analysis result for SHA-256 8362d3cb3e00ad4e…

MALICIOUS

PDF

31.5 KB Created: 2020-03-08 05:20:39 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 19fe15f1c61b0c950e8d0d54298c6708 SHA-1: 816c14f0241b292feeecda0d6d5de5f57bea24f8 SHA-256: 8362d3cb3e00ad4ec6b56e642a61c86f90271b4b85382cc720a21b1a200e196f
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the observed link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://bi5q2l.salon225.com/uploads/1/3/0/3/130312925/130312925.html#functional+skills+maths+level+2+practice+tests+bitesize
    • http://www.renocare.co.uk/uploads/1/3/0/2/130272458/gudebagu.pdf
    • http://coplandia.com/uploads/1/3/0/6/130620417/katezufokalokog_joguxeka.pdf
    • http://sgconsultation.com/uploads/1/3/0/5/130542907/cc316247e.pdf
    • http://amymakesgames.com/uploads/1/3/0/5/130589251/kekogowa.pdf
    • http://norwalkunitedmethodistchurchiowa.com/uploads/1/3/0/4/130483263/baleti.pdf
    • http://stellarosemarywalling.com/uploads/1/3/0/7/130776740/kozere.pdf
    • http://www.powerfarmmachine.com/uploads/1/3/0/9/130969327/b2cd842.pdf
    • http://joeandhannah.org/uploads/1/3/0/5/130539341/xolozujuxozulavimefe.pdf
    • http://gwenjacksonstories.net/uploads/1/3/0/7/130739416/safelasifota.pdf
    • http://barriebasketball.com/uploads/1/3/0/2/130287871/reviwop-migez.pdf
    • http://alcovyblue.com/uploads/1/3/0/5/130550858/a403253730f16.pdf
    • http://davishedrick.com/uploads/1/3/0/6/130620217/gulalupukazuguk.pdf
    • http://300wyandotte.com/uploads/1/3/0/4/130435654/2610378.pdf
    • http://teamdelta.net/uploads/1/3/0/7/130738591/tokonejesudiw-boburowenomor-rexusolidi.pdf
    • http://dandglettings.com/uploads/1/3/0/4/130478882/f7cfcdd733.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_off000055e0.bin
84a277da22bfd56c1e2ade2e99a6a5a6c755c155f4f4320dbe472462de919bef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55E0 6696 bytes

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