Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d1681fec1f6da0…

MALICIOUS

PDF

35.5 KB Created: 2020-04-07 22:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: a50260d8b04508e287e763d22dcb3665 SHA-1: 77d45df1eb084bc810ebaa3d04eb136b93db9911 SHA-256: 92d1681fec1f6da04929f6b81e8748721ee520963adfb90eabd4c16e34e0413a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous links to external websites, many of which appear to be part of a link farm designed to manipulate search engine results. The document body, though heavily obfuscated, contains references to 'data science and big data analytics' and includes URLs that are likely intended to lead the user to malicious content or phishing pages. The heuristic 'PDF_SEO_LINK_FARM' strongly indicates a malicious intent to use SEO techniques for distribution.

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://lashsupportbytootie.com/uploads/1/3/0/7/130739156/130739156.html#data+science+and+big+data+analytics PDF link annotation
    • http://jeremyfofrich.com/uploads/1/3/1/4/131437941/1820385.pdfIn PDF document text
    • http://abmultiservices.fr/uploads/1/3/0/5/130551067/zebobopud_lonojul_pekugobupeduxem.pdfIn PDF document text
    • http://digitgems.com/uploads/1/3/0/3/130323229/gonere.pdfIn PDF document text
    • http://newmintage.com/uploads/1/3/0/5/130550969/jefomitotuvufa_vutajusoxosigib_xatemitagu_bunamonozix.pdfIn PDF document text
    • http://lohtest.com/uploads/1/3/0/3/130313531/musugip.pdfIn PDF document text
    • http://salonmt.com/uploads/1/3/1/1/131163841/telikoduf.pdfIn PDF document text
    • http://vanhapostitalo.com/uploads/1/3/1/0/131070434/4429633.pdfIn PDF document text
    • http://vincentfatato.com/uploads/1/3/0/6/130604402/9ed574981839b.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

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6217 8076 bytes
SHA-256: b1d6aeca15fea5141239110b0e8df56a05924f05d4f89909690a53360595e430

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