Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4179d189e06028…

MALICIOUS

PDF

37.4 KB Created: 2020-03-23 11:28:48 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ed836bdbaeae1dce75e269cf58d567bd SHA-1: 78b1cccbb6d779becdbdc49422b5933fbf9af8a0 SHA-256: 3f4179d189e060289c311d911d35c2a6d73475a5d017a22901cebc7bd430558d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Gather Victim Identity Information T1204 Malicious Link

The PDF file contains a large number of external links to other PDF files hosted across various domains. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or improve search engine rankings for malicious sites. No scripts were extracted, and the document body is largely unreadable, but the heuristic firings strongly suggest a malicious intent related to link distribution.

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://headblocks.org/uploads/1/3/0/8/130874394/130874394.html#esl+giving+directions+vocabulary+list
    • http://clairray.com/uploads/1/3/0/2/130289294/9961671.pdf
    • http://cpanel.rinatoshop.com/uploads/1/3/0/7/130738798/sivirimenuno.pdf
    • http://mirrorlessprod.com/uploads/1/3/0/7/130776105/givureni-tuzozalapewa.pdf
    • http://10thavenuerebuilders.com/uploads/1/3/0/5/130551051/1e15aaae9ab0.pdf
    • http://thecollectionbase.com/uploads/1/3/0/6/130620613/8f026500f7.pdf
    • http://cherlynskincare.com/uploads/1/3/0/2/130288364/nosek.pdf
    • http://merakidestinationmanagement.com/uploads/1/3/0/6/130639733/wusoxiparile.pdf
    • http://hotgrassandvines.com/uploads/1/3/1/0/131071082/348dbb8f11ad2.pdf
    • http://cannabisrunvt.com/uploads/1/3/0/3/130313156/dovasunijukod_jasapelaz_jepisigefoti.pdf
    • http://postcardstocd1voters.com/uploads/1/3/0/2/130270912/jinipenesimusak.pdf
    • http://hostmaster.vldhulshout.be/uploads/1/3/0/2/130289801/dikuredelulapaj_pebobodujipino.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_off0000691e.bin
b1644d4b5b90340784c5dccf08c14a47a1ba16a11031de4c667382210f6d9bce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x691E 8248 bytes

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