Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b71d4878a79d13…

MALICIOUS

PDF

37.8 KB Created: 2020-04-09 21:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a3c06977cff7f692ef794d17251e961c SHA-1: 1ac4c549be4011d08d0f2c4b141cbce800a12486 SHA-256: 61b71d4878a79d135c40c191403bd067b734b9d78ff3b860507f330f62377923
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, many of which point to other PDF files hosted on various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external link farm, suggesting the primary purpose is to drive traffic to these sites, potentially for SEO manipulation or as a phishing lure. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports a malicious intent.

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://cdp305.com/uploads/1/3/1/1/131164417/131164417.html#refus+de+se+soumettre+aux+v%C3%A9rifications
    • http://homebasedbiz.info/uploads/1/3/0/4/130477566/74f1b00.pdf
    • http://kenairivercottage.com/uploads/1/3/0/6/130639489/mogepawazuze.pdf
    • http://sjvschoolbr.org/uploads/1/3/1/4/131406348/sasometave.pdf
    • http://jeffshai.com/uploads/1/3/0/7/130775987/1412a21.pdf
    • http://chinatowncodes.com/uploads/1/3/0/2/130289589/gojinimidupunok.pdf
    • http://skinnylaxi.com/uploads/1/3/0/6/130621212/3791191.pdf
    • http://dimensionsaga.com/uploads/1/3/0/6/130621596/doveki.pdf
    • http://historichomelife.com/uploads/1/3/0/4/130490488/6687823.pdf
    • http://napashuttlelimo.com/uploads/1/3/0/5/130590143/nuginag.pdf
    • http://amandamccreary.org/uploads/1/3/0/5/130542870/5c723e23.pdf
    • http://cidayltd.com/uploads/1/3/1/4/131437737/tebigovapagele_gaxejopuwese.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_off0000680e.bin
d716d3089dfa317e7d7250a7b9afbbcf9d090f53094bfed68ceffeca2f1222db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x680E 9076 bytes

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