Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c44081c92c09a4…

MALICIOUS

PDF

40.9 KB Created: 2020-04-17 05:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7e30380b43b8eebddbfcf0bef23f6834 SHA-1: 1ada6b41e24c7211ef080c98a0c2ffc7a0734475 SHA-256: 89c44081c92c09a4a563599672746271e520f844be144c311a07556925427084
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, a technique often used for SEO spam or to distribute malicious payloads. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the embedded URLs suggest a phishing or content distribution vector, potentially leading to further malware.

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://bhsfineartsboosters.org/uploads/1/3/1/3/131379894/131379894.html#biggie+smalls+answering+machine+song
    • http://autumncalica.net/uploads/1/3/0/2/130271035/veribepo-biliwutubow-kusizovav.pdf
    • http://thehangedmen.com/uploads/1/3/0/8/130874148/aead67bdd983.pdf
    • http://pratfallingthroughlife.com/uploads/1/3/1/3/131379444/f49bb.pdf
    • http://samokan.com/uploads/1/3/0/8/130874670/8829197.pdf
    • http://ablowe.com/uploads/1/3/1/3/131382320/ripurisiruf-ragogitev-pokirarepotopi-tixibixakak.pdf
    • http://rzlifecoach.com/uploads/1/3/1/3/131382248/ff0940a41e64.pdf
    • http://hondenschoolarnhem.nl/uploads/1/3/0/5/130588810/boduvofofinapejigulo.pdf
    • http://nuggwholesale.com/uploads/1/3/0/8/130814030/senotodola-lulemujiravi-zanif-dosakop.pdf
    • http://worldinfonews.org/uploads/1/3/0/5/130588867/effb54d7cb004.pdf
    • http://penneaugroup.com/uploads/1/3/0/5/130551898/9880322.pdf
    • http://iesvschristians.com/uploads/1/3/0/2/130271082/zobopo-kuvuxoxaj-naweb-tonopovokuvubim.pdf
    • http://webfactura.co/uploads/1/3/0/7/130738534/dadazaraner-banar-vobifetudunisat-bezalur.pdf
    • http://lgbtrans.com/uploads/1/3/0/2/130271094/wipupi.pdf
    • http://leegray.com/uploads/1/3/1/3/131379584/gudovizeje-suvutufabovipop.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_off0000796f.bin
c5cd37a0e6223a3940d138e7c81f6bb4d837af8d67b4c40386cca72d2beb760b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x796F 7760 bytes

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