Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ad15f8485228ca…

MALICIOUS

PDF

55.8 KB Created: 2020-03-07 14:15:17 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 36a9221d690bbdc39cb9b5c6f110ae5f SHA-1: 82c6a86861b6cbb5ea56e21ce04b9888a0a7cdc2 SHA-256: 67ad15f8485228ca2ef091f0935a82863dd847d36d21e7162157e02371f2d248
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious SEO or content distribution scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URLs indicates a likely attempt to redirect the user to potentially harmful content or phishing sites.

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://host71.carmichaelnl.com/uploads/1/3/1/0/131070195/131070195.html#half+wave+uncontrolled+rectifier
    • http://braunmaguirejewelers.com/uploads/1/3/0/8/130814774/fudepiferiboj-jajiwe-pufifovaj-piregiti.pdf
    • http://utuppercervical.info/uploads/1/3/0/8/130874077/2925233.pdf
    • http://healthyheartcirculationformula.com/uploads/1/3/0/6/130621614/vekuwawugi_gobofoxul.pdf
    • http://fischertaketwo.com/uploads/1/3/0/5/130547552/69a738783f29.pdf
    • http://mail.jjlearningfarm.com/uploads/1/3/0/4/130490328/2de220de0abf5.pdf
    • http://www.mmalifestyler.com/uploads/1/3/0/9/130968906/jinoju.pdf
    • http://discerningheartsministry.org/uploads/1/3/0/8/130874376/ab41b6982a66.pdf
    • http://deadpointfilm.com/uploads/1/3/0/6/130620803/xadegadukikiz.pdf
    • http://themanadvice.com/uploads/1/3/0/4/130490776/8060093.pdf
    • http://sophieleblancvisualmedia.com/uploads/1/3/0/7/130740211/lobiwu.pdf
    • http://silkroadsourcing.co/uploads/1/3/0/7/130740349/tamujoba.pdf
    • http://sckatelynham.com/uploads/1/3/0/4/130435532/parebedag_mefodotepu_velufero_jafomote.pdf
    • http://enola-theword.com/uploads/1/3/0/5/130551708/naluzibafose_gebanejax.pdf
    • http://autodiscover.connectimacy.com/uploads/1/3/0/6/130620878/biripuvelutire-tudujaw.pdf
    • http://shanebrelesky.com/uploads/1/3/0/5/130547846/zozugodubewazoxus.pdf
    • http://texanhomestudy.com/uploads/1/3/0/6/130603942/zobifivuwi_namizikebozugar_rarewoxi.pdf
    • http://nadzorybudowlane-arles.pl/uploads/1/3/0/6/130620601/101f2656.pdf
    • http://www.aandecreation.com/uploads/1/3/0/5/130589312/3798192.pdf
    • http://www.workconnectstaffingservices.com/uploads/1/3/0/7/130775509/xosadiz_gewira_zivanob_gunogir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008e68.bin
c0c630e0bc86464a29e2d865bc1d0fd512a077078acd227df0f73b5d89317c87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E68 8668 bytes
font_01_sfnt_off0000af99.bin
7fc070dc1df7104de25b048de5b02a117373465c7292c60cd89a0d6367a67996		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF99 3512 bytes
font_02_sfnt_off0000bbc1.bin
bd063a73df92dd3638e57e21446ee7f23fd344289568077020165c142934ec29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC1 16116 bytes

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