Malicious PDF — malware analysis report

Static analysis result for SHA-256 1414cfc088ed7bf7…

MALICIOUS

PDF

37.4 KB Created: 2020-04-03 07:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9bb85836095add272cedc26042519914 SHA-1: 087cb6776545a7b5906996da973541ff6d86ab23 SHA-256: 1414cfc088ed7bf7e081df8fe150ebde4653ea1ad14b021336f4eea7a96dbe52
96 Risk Score

Malware Insights

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

This PDF file was identified as malicious by an ML classifier with high confidence. It functions as a link farm, containing a large number of external links to other PDF documents hosted on various domains. The primary purpose appears to be SEO manipulation or the distribution of further malicious content through these linked PDFs. The presence of numerous external links suggests an attempt to direct users to potentially harmful resources.

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://retfish.org/uploads/1/3/0/7/130775972/130775972.html#asus+m5a78l-m%2Fusb3+manual
    • http://primbb.com/uploads/1/3/0/3/130323774/1762759.pdf
    • http://proteus-internetmarketing.com/uploads/1/3/0/5/130550826/4236290.pdf
    • http://pospaperhawaii.com/uploads/1/3/0/9/130969790/5d553ea35.pdf
    • http://desertskydoodles.com/uploads/1/3/1/3/131398440/dekemeve_jufevot_sotumarema_sobefagubat.pdf
    • http://plussizebridesmaiddressesnewhampshire.com/uploads/1/3/1/4/131453456/6723461.pdf
    • http://reliancearb.com/uploads/1/3/0/6/130622089/melimuminaj.pdf
    • http://popllectibles.com/uploads/1/3/0/5/130543995/805a77f5f.pdf
    • http://massageottawa.site/uploads/1/3/0/7/130739883/gasasifogavipu.pdf
    • http://lynchspecialtyservices.com/uploads/1/3/0/4/130435688/4142040.pdf
    • http://calsafe.net/uploads/1/3/0/3/130380084/soperakejakikufijug.pdf
    • http://discoveringinspiration.com/uploads/1/3/0/8/130814397/tuxepageri.pdf
    • http://emeseargentina.com/uploads/1/3/1/4/131414743/a470ad8.pdf
    • http://moonstonemelodyllc.com/uploads/1/3/0/6/130605498/f7526.pdf
    • http://modeltrainersusa.com/uploads/1/3/1/1/131163579/rababususabukuwip.pdf
    • http://shenvargrade3.com/uploads/1/3/0/7/130738673/filevitezi-zadedoluv-tojukunivizibo.pdf
    • http://northernlightshockeynj.com/uploads/1/3/0/2/130287972/4802180.pdf
    • http://jocarpetsllc.com/uploads/1/3/0/6/130621964/2133548.pdf
    • http://lauren-mitchell.com/uploads/1/3/0/7/130739383/pafevuvedipowiw.pdf
    • http://inthelanemarkers.com/uploads/1/3/0/2/130289809/goxokafamoj_jiwagidubuxob.pdf
    • http://briannopperyachts.com/uploads/1/3/1/4/131437886/sokija.pdf
    • http://msgems.org/uploads/1/3/0/4/130491513/e977be6f.pdf
    • http://nextgensoftball.com/uploads/1/3/0/7/130775728/zaderewasiridavun.pdf
    • http://columbiarivergallery.org/uploads/1/3/0/5/130543684/raxon.pdf
    • http://thezaclane.com/uploads/1/3/0/6/130604355/d1de12c83f.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_off00006a82.bin
f1024611680a8e10bf38c8f1605fb767a0b1eb8125b76317b0181c89d57f07ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A82 7468 bytes

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