Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df412384d9ebea6…

MALICIOUS

PDF

37.6 KB Created: 2020-06-18 00:39:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 9d1187194a86b29f875cf57ea0478d6f SHA-1: c22d45f1034177784f122b51a151f5fb73078855 SHA-256: 3df412384d9ebea6c3503710d0154eaee1b7b50951793af008fd5f99633ae7d6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links, many of which point to other PDF files hosted on unrelated domains. This behavior is characteristic of a link farm, often used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking pattern. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://d.undesirable.us/uploads/1/3/1/8/131856757/131856757.html#environmental+impact+assessment+guidelines+nsw PDF link annotation
    • http://jllcapitalmarketslincolnbp.com/uploads/1/3/0/5/130538875/b2c1b077f2bd6c.pdfIn PDF document text
    • http://techmehow.com/uploads/1/3/1/3/131380316/dalojowaturizoz.pdfIn PDF document text
    • http://lovercosmetics.com/uploads/1/3/0/6/130620363/7472282.pdfIn PDF document text
    • http://msgarletts-hancock.com/uploads/1/3/0/2/130272613/665ffd50e.pdfIn PDF document text
    • http://kariongphysiotherapy.com/uploads/1/3/0/5/130588923/2825192.pdfIn PDF document text
    • http://graysanatomical.com/uploads/1/3/0/6/130604452/6015b1a0f946b72.pdfIn PDF document text
    • http://centralmusicschool.com/uploads/1/3/0/5/130550967/zezugosa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 7

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000543d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x543D 5384 bytes
SHA-256: b1459c38896d8c84e3f982078ecd5aec3f0cb5295418f68f65e6ac9a40eaf7ec
font_01_sfnt_off0000667a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x667A 9932 bytes
SHA-256: c5ce408463796710a04f65eb1c1b3e3867a7e292331ea5e5da0a48cecc10753e

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