Malicious PDF — malware analysis report

Static analysis result for SHA-256 678a2197292ae712…

MALICIOUS

PDF

38.5 KB Created: 2020-03-13 02:17:20 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6cc23804413b85c4e795bb4d94e5e78c SHA-1: 198446b188893616d5cae721238170824c871984 SHA-256: 678a2197292ae712df8ae88b502733f9ed7413b38ecadf3386d98f12ec4c2cd4
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files hosted on similar domains. This pattern is indicative of SEO poisoning or a link farm designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

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://mianduimianshipinqipaiyouxi.br3h.com/uploads/1/3/0/5/130539427/130539427.html#pan+card+application+form+49a+latest
    • http://blackdermaparis.com/uploads/1/3/0/4/130488328/8084908.pdf
    • http://mlbcruises.com/uploads/1/3/0/2/130289756/7235569.pdf
    • http://greatmomentsinspace.com/uploads/1/3/0/6/130604638/2500294.pdf
    • http://holmanhouse.net/uploads/1/3/0/5/130544243/435838.pdf
    • http://stanpleinair.com/uploads/1/3/0/2/130287988/mekivotoxaneba-japupepen.pdf
    • http://myteam-mom.com/uploads/1/3/0/5/130542853/7589844.pdf
    • http://50cupswithbobby.com/uploads/1/3/0/8/130813094/e53f0d162.pdf
    • http://mynirvani.com/uploads/1/3/0/6/130621908/1750fab8db.pdf
    • http://capetownattorney.com/uploads/1/3/0/7/130775506/6e9981b5.pdf
    • http://zagleverage.com/uploads/1/3/0/5/130543346/245784.pdf
    • http://shepardphotography.org/uploads/1/3/0/7/130738707/9378938.pdf
    • http://mta-sts.mail.kramwoman.com/uploads/1/3/0/5/130551013/werosuraterifi.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_off00006b9b.bin
fbe301cca42cf9a3a67939b1875ed02686186c87ece2682d64f971bbde07a326		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B9B 8848 bytes

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