Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1160e0790fd6a0…

MALICIOUS

PDF

48.0 KB Created: 2020-04-09 04:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 57a0ca944974e1203c703a9e998056f2 SHA-1: 1adc6ef1a678c7a3815469a8eb76f27b7fc2dcdf SHA-256: 0b1160e0790fd6a0897ca6636b341bc7ddccedf6b27bd1ad7ee223793d909626
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a link farm. No scripts were extracted, but the sheer volume of external links points to a malicious intent to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://alexmcmichael.com/uploads/1/3/0/6/130621487/130621487.html#como+llegar+de+plaza+satelite+al+metro+rosario
    • http://attorneymoh.com/uploads/1/3/0/2/130291975/8c425f1200.pdf
    • http://brndpix.com/uploads/1/3/0/6/130639767/4f589d3bb31c69.pdf
    • http://davidcamillotucci.com/uploads/1/3/0/5/130546519/8347136.pdf
    • http://jasonnnicastro.com/uploads/1/3/0/4/130436162/zukada_tunijulutapevem.pdf
    • http://airconreviewed.com/uploads/1/3/0/6/130620781/zijuxolas.pdf
    • http://icamedic.net/uploads/1/3/0/6/130640190/felajogukoragux-nizalawir-lalakew.pdf
    • http://butwheredoyougetyourprotein.com/uploads/1/3/0/5/130588480/wejexemeb-todisogunopug.pdf
    • http://sesametheopossum.com/uploads/1/3/0/7/130739519/a21c0ea7d35.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/
    • http://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007fa4.bin
47a02638effdf55c9f68801802055205be6ba930b549c84a0a4b8f2ea4656f66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA4 10076 bytes
font_01_sfnt_off0000a3e7.bin
885781ec91db75dc8c4a6a3d3dac0324bdfdb8f2239dab70466c62035ae072da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3E7 4144 bytes

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