Malicious PDF — malware analysis report

Static analysis result for SHA-256 b69b29c27bb84895…

MALICIOUS

PDF

39.6 KB Created: 2020-04-01 15:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0dac99ef5f121e5d7c8140c488a1ec1b SHA-1: bef3bab543005eff998383c90be4e99c3740d155 SHA-256: b69b29c27bb848955f8f75897b3c9c4d3f88381f8738432155575230f4e6e580
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a large number of external links pointing to other PDF files across numerous domains. This pattern is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly supports the malicious verdict, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious nature of the embedded URLs.

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://mesys-industrial.net/uploads/1/3/0/6/130621757/130621757.html#choral+intonation+exercises+pdf
    • http://latevocations.org/uploads/1/3/0/5/130540106/xuwazofafazotagiven.pdf
    • http://brigitte-puschmann-studio.com/uploads/1/3/0/5/130590456/nubumaxepufom.pdf
    • http://theinfinuum.com/uploads/1/3/0/5/130588294/2024099.pdf
    • http://dayakquest.com/uploads/1/3/0/2/130272848/sekunijumosix_wujuruduwusor.pdf
    • http://celldoctorsfarmington.com/uploads/1/3/0/5/130588438/kawigenaxu.pdf
    • http://elizabethvalencia.net/uploads/1/3/1/0/131070723/napepugudofuvuv-pomuvefononu-jezafunupek.pdf
    • http://getnakedbathandbody.com/uploads/1/3/0/8/130814143/6961534.pdf
    • http://ediblealchemy.organic/uploads/1/3/0/5/130551391/2ab2af64c0e4.pdf
    • http://johnaadams.com/uploads/1/3/0/2/130270905/bd16cf2246b.pdf
    • http://mysticpcs.com/uploads/1/3/0/6/130604487/543e4766b7c1ca4.pdf
    • http://nomorediamonds.com/uploads/1/3/0/3/130324005/beletobifurumugipuri.pdf
    • http://dianataylortarot.com/uploads/1/3/1/3/131379444/gugitimenedolibiva.pdf
    • http://meganrundelphd.com/uploads/1/3/1/3/131379612/067f15ef8b.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_off00007526.bin
85eb74904e1e2d128e015ba9486762cfb6748e11ba74971f82b627e1b5c9a36a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7526 7288 bytes

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