Malicious PDF — malware analysis report

Static analysis result for SHA-256 68dd3f8fbc60fc0d…

MALICIOUS

PDF

41.6 KB Created: 2020-03-07 12:08:54 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b36093107a376c0bf36e3783c334cd2f SHA-1: 5ad6ed922a9af213b4b014d2414a67060ad5e441 SHA-256: 68dd3f8fbc60fc0dd2a8bc846ba438daafa861a8b688267b705e40e1a364a539
136 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 SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous generated URLs supports this assessment. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially malicious content.

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://hayleys-sugar-flowers.com/uploads/1/3/0/5/130590412/130590412.html#isometric+abdominal+exercises+pdf
    • http://chicagolatexproducts.com/uploads/1/3/0/4/130488694/8791034.pdf
    • http://meeting.banjodanielmusic.com/uploads/1/3/0/6/130621280/766054.pdf
    • http://jenfifield.com/uploads/1/3/0/5/130546283/4746080.pdf
    • http://catcommotion.com/uploads/1/3/0/4/130477490/3f41d39b.pdf
    • http://4n0.com/uploads/1/3/0/4/130435938/dofefuworumupi_walumosaw.pdf
    • http://yournaturallybrightpatiocovers.com/uploads/1/3/0/9/130969048/80f1ef.pdf
    • http://tamarko.com/uploads/1/3/0/6/130603882/2900555.pdf
    • http://thewildflowerfarminn.com/uploads/1/3/0/7/130776358/2904420.pdf
    • http://hhswriters.org/uploads/1/3/0/6/130620836/ritav.pdf
    • http://jakealakazam.com/uploads/1/3/0/2/130270866/wavuruxuvibav.pdf
    • http://capieducandoparadejarhuella.com/uploads/1/3/0/2/130271058/693175.pdf
    • http://www.jimmylaskowski.com/uploads/1/3/0/8/130874614/9944903.pdf
    • http://www.cleokrejci.com/uploads/1/3/0/8/130813320/2509287.pdf
    • http://myfujingarts.com/uploads/1/3/0/2/130272483/fepomis.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_off00007af7.bin
032a73401832194cf4ba9c398d1c8d9bc2814dc5f9ba06ce0e697ec643bf9155		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF7 7848 bytes

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