Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f194aedeaf3952…

MALICIOUS

PDF

35.7 KB Created: 2020-03-07 22:58:50 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2021-10-23
MD5: 8c6693ebd601b8d97d0ecceee05b001c SHA-1: 99ebf80bc0fedc08576d70fd4e366184390c02b9 SHA-256: 57f194aedeaf39525064382f462502890748a9c6c3c67a7966f3fdc7922078b3
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to similarly structured URLs on different domains. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic suggests a link farm designed to distribute malicious content or phish users. The document body, though obfuscated, contains URLs that are likely part of this distribution network.

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://adsl-63-204-18-11.benefitplans.org/uploads/1/3/0/4/130488401/130488401.html#biuret+test+for+amino+acids PDF link annotation
    • http://mail.portsmouthlifeguards.org/uploads/1/3/0/6/130621385/1932451.pdfIn PDF document text
    • http://animspree.com/uploads/1/3/0/5/130589401/6379874.pdfIn PDF document text
    • http://szkolenia-termowizja.pl/uploads/1/3/0/4/130483132/8257942b02f.pdfIn PDF document text
    • http://mta-sts.mx.curtisnewmanartist.com/uploads/1/3/0/6/130603890/2071392.pdfIn PDF document text
    • http://www.bottomshirts.com/uploads/1/3/0/3/130323120/3580037.pdfIn PDF document text
    • http://kravepixel.net/uploads/1/3/0/7/130776200/lorudog.pdfIn PDF document text
    • http://mx.pelegreenberg.com/uploads/1/3/0/4/130488169/2201547.pdfIn PDF document text
    • http://www.izzyandsami.com/uploads/1/3/0/5/130588287/1494313.pdfIn PDF document text
    • http://uberscrudu.com/uploads/1/3/0/6/130639849/89ebd4ee.pdfIn PDF document text
    • http://freecryptocurrency.club/uploads/1/3/0/5/130539059/deburebukujaj.pdfIn PDF document text
    • http://mormon-clothes.com/uploads/1/3/0/7/130740627/8020353.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6439 7708 bytes
SHA-256: cd31c8c73c06cb5ba0b364fc0b73a41910b70ad5f05c4386cdbfbca1a61dbb2b

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