Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a134411dcd423f…

MALICIOUS

PDF

41.7 KB Created: 2020-03-28 14:23:58 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 461c06fefa3159ff0fdaed83afe5cfb3 SHA-1: 1f3d4c76d501efe0b350e673177287cc55aaa831 SHA-256: 76a134411dcd423f5a8d64fdd95353740b3d3442965b4baa03c7dc7b205b5f0b
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. The document body also contains a prominent URL that appears to be a payment-related link. This suggests a link farm or phishing attempt designed to redirect users to malicious sites. No scripts were extracted, but the PDF structure and numerous external links are indicative of a malicious intent to lead users to potentially harmful content.

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://thesoonernetwork.com/uploads/1/3/0/7/130738963/130738963.html#http+%2F%2Fwww.educacion+a+distancia.eneo.unam.mx%2Fpagos%2F
    • http://boobysbeachshop.com/uploads/1/3/0/2/130270863/wunepozijujaru.pdf
    • http://cannisave.net/uploads/1/3/0/7/130739597/wiwolilaf-dexuxiva-jevulav.pdf
    • http://webdisk.samanthasprings.com/uploads/1/3/0/7/130740573/1d871.pdf
    • http://orockrotorua.co.nz/uploads/1/3/0/6/130639093/kusututovutad-rejaw-mimisuwupo-jipole.pdf
    • http://nfondy.com/uploads/1/3/0/6/130621212/1714442.pdf
    • http://momsbluecookbook.com/uploads/1/3/0/8/130874233/6486529.pdf
    • http://aristotlecircle360.com/uploads/1/3/0/7/130776055/derodufobis.pdf
    • http://ioimpresa.net/uploads/1/3/0/6/130621675/c45fe53.pdf
    • http://skylineconstructionnw.net/uploads/1/3/0/8/130874111/9226129.pdf
    • http://chisellemedspa.com/uploads/1/3/0/3/130323401/vixomaparamu.pdf
    • http://stemvets.org/uploads/1/3/0/5/130590469/toxexaguker.pdf
    • http://nicoleedwardslimited.net/uploads/1/3/0/7/130775518/54f57c8bdebd1.pdf
    • http://elorahopyards.ca/uploads/1/3/0/6/130603747/77c59.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_off00007715.bin
9b7b3b4a2e4268746bfc432e6446fd375b9bfd2a141d65bdb22beca278e2ecb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7715 9012 bytes

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