Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c085a48a83c286…

MALICIOUS

PDF

32.6 KB Created: 2020-03-27 12:52:55 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1ad45234e04e2fbd2e60cabedeefa944 SHA-1: 1dc83d5765f6b7a21352446b8e2a12b9276c3803 SHA-256: 81c085a48a83c2866753a386e12dc3e67c1ece7fa13a9c882c498cfcf63f9cd4
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to other PDFs hosted on different domains. This pattern is indicative of a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier strongly supports the malicious nature of this document. No scripts were extracted, but the extensive use of external links suggests a delivery mechanism for further payloads.

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://kyotohibachiwiscdells.com/uploads/1/3/0/2/130287456/130287456.html#artesania+latina+endeavour+build+log
    • http://gcbuilders.net/uploads/1/3/0/6/130605253/4944745.pdf
    • http://www.brandslamm.com.au/uploads/1/3/0/2/130291908/153dc70823.pdf
    • http://www.sewdivinecreations.com/uploads/1/3/0/5/130589260/aeba579fe2287.pdf
    • http://rozelcruz.com/uploads/1/3/0/5/130543190/2870831.pdf
    • http://eloriginalnightclubbar.com/uploads/1/3/0/8/130874477/8489303.pdf
    • http://www.jbjewels4u.shop/uploads/1/3/0/2/130287281/kowodujixoxe.pdf
    • http://morganadvisory.info/uploads/1/3/1/0/131069859/ab52029e577ea.pdf
    • http://starvend.ca/uploads/1/3/0/3/130313049/8087332.pdf
    • http://archealthservices.org/uploads/1/3/0/6/130639396/bijasa.pdf
    • http://serentityconsulting.services/uploads/1/3/0/6/130639590/sisowejamikopiwu.pdf
    • http://balevillecongregational.com/uploads/1/3/0/6/130603696/8218529.pdf
    • http://methodalliance.org/uploads/1/3/0/6/130605349/587049.pdf
    • http://urbanmintbtq.com/uploads/1/3/0/6/130603772/xofixuwujadavijajal.pdf
    • http://www.reveil-corporel.com/uploads/1/3/0/5/130540661/lijajaxedabop.pdf
    • http://vilivinggroup.com/uploads/1/3/0/7/130775180/vamug.pdf
    • http://mta-sts.mail.oakgrovefarmstn.com/uploads/1/3/0/7/130739693/sitaf_togerag_mapetarokezeti.pdf
    • http://brokrmusic.com/uploads/1/3/0/7/130776314/xerotoxepewube.pdf
    • http://constructionwiseau.com/uploads/1/3/0/7/130738647/jukef.pdf
    • http://csmx.info/uploads/1/3/0/3/130312998/2f0cd.pdf
    • http://moorelift.org/uploads/1/3/0/9/130969300/nubuw.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_off00005ae8.bin
a1838fc22f023ee60efe2ab92c64d060ceef1babc6cdc33cd4ad0d7c306082e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AE8 6512 bytes

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