Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b7f30a76e7622f…

MALICIOUS

PDF

28.6 KB Created: 2020-04-26 00:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: da51a6140eee3a3531c14d22bfdc320c SHA-1: f8662d54743e9b15dab2b82e47a2c7e070c63659 SHA-256: a3b7f30a76e7622f3942db7d6c99dfaef5e28d106c3868007b398f95e3086c75
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to similarly structured URLs on different domains. This pattern is indicative of a link farm or SEO poisoning technique, designed to drive traffic to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that the embedded links are part of a malicious campaign. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://afaparents.org/uploads/1/3/0/2/130270864/130270864.html#bitumen+roofing+sheet+for+sale
    • http://vatadezahar.com/uploads/1/3/0/3/130313391/1964644.pdf
    • http://chamazon.com/uploads/1/3/1/4/131406173/4ec07a3.pdf
    • http://designingpathways.org/uploads/1/3/0/5/130547552/zuxafa.pdf
    • http://utmb-phto-ms.info/uploads/1/3/0/6/130639720/fatirutuvokinel.pdf
    • http://worldheartsfairtrade.org/uploads/1/3/0/8/130813730/3891162.pdf
    • http://joramirezportfolio.com/uploads/1/3/1/4/131453985/somatobaxeso.pdf
    • http://tsjmanagement.com/uploads/1/3/1/3/131383764/zomozuxobebe-gasejawejarova-zolubikorurenun-kejamaregumu.pdf
    • http://emilyandjohnskypelovers.com/uploads/1/3/0/8/130874329/zonipazaka.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004399.bin
cb3892ccec399b86f6d8db494445eb9bc0ddf9e7de5dbf023fd3987ea75a2b1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4399 6440 bytes
font_01_sfnt_off00005d8f.bin
6a51e6b8f4328f7ace1819cabb52c31d6f88f37788dedbdf121899c6e5a6ea9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8F 2600 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.