Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c0ad30ed94a5f7…

MALICIOUS

PDF

30.4 KB Created: 2020-04-16 02:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b9db102d9c945e1784185780a4d4c985 SHA-1: 55bf12a6b0710ad97049d7722c4142b0f7798d59 SHA-256: 79c0ad30ed94a5f7bad4bd06a12cbabe9585abdbc9a5b723704579ecfb932524
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a large number of external links, characteristic of a link farm or SEO manipulation scheme. The embedded document body, though heavily obfuscated, contains URLs that are also present in the extracted URL list. The primary function appears to be directing users to a network of potentially malicious or spam-related websites.

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://dancinggoatsanctuary.com/uploads/1/3/1/6/131606636/131606636.html#ambareesha+kannada+songs
    • http://blakebuilds.us/uploads/1/3/1/4/131407922/marilibone-xijexoda-titiwedode.pdf
    • http://obrienventures.com/uploads/1/3/0/7/130739607/003b598ad660.pdf
    • http://asirap.org/uploads/1/3/0/2/130291640/9296593.pdf
    • http://ucpkp.com/uploads/1/3/0/2/130270923/1893dc.pdf
    • http://stdesignmatters.com/uploads/1/3/0/5/130588716/4009312.pdf
    • http://jgtorresenterprises.com/uploads/1/3/0/6/130621082/nivuzomanuja-wurubaxage.pdf
    • http://96-sle-gmc-sierra.com/uploads/1/3/0/2/130273814/3295261.pdf
    • http://torontowinenews.com/uploads/1/3/0/5/130539757/3511877.pdf
    • http://be-huetet.ch/uploads/1/3/1/4/131453374/4326eaaf.pdf
    • http://kathryns-beaded-jewelry.com/uploads/1/3/0/4/130475982/vezujemodakix-fabobivox.pdf
    • http://necesitoarte.com/uploads/1/3/0/9/130969790/2217669.pdf
    • http://clendeninpentecostalchurch.com/uploads/1/3/0/6/130604542/ca84b4f4c5.pdf
    • http://brendonsingh.com/uploads/1/3/1/3/131398176/67aef2cd181b.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_off00005153.bin
9558478f307e96e1900587f83a3cc288b3eb4a6bd529c37e304e3b68f1db7945		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5153 7204 bytes

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