Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d7f06c20ac79b9…

MALICIOUS

PDF

30.9 KB Created: 2020-06-06 12:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 66bb24c0e4f71af4cb317fcbd9b99d21 SHA-1: c92cc355d33ff20ac3bd623295447e44506ba902 SHA-256: 31d7f06c20ac79b9712c5185c267951ddbcb89d595c0040a0b445b4f5fa89a7f
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on newly created domains and point to other PDF files. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm or redirection mechanism. The document body, though partially corrupted, contains references to 'Avaya one-x deskphone manual' and the authoring application 'wkhtmltopdf', indicating a lure to disguise the malicious links. The primary intent appears to be directing users to potentially malicious websites through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://kyflowernseed.com/uploads/1/3/0/8/130814200/130814200.html#avaya+one-x+deskphone+manual PDF link annotation
    • http://silvaentertainment.net/uploads/1/3/1/4/131438453/dikodomabin_zatukuleb.pdfIn PDF document text
    • http://newnamenow.com/uploads/1/3/1/3/131380031/4783262.pdfIn PDF document text
    • http://cetkadienstleistung.de/uploads/1/3/0/7/130739116/9a7485.pdfIn PDF document text
    • http://kyflowernseed.com/uploads/1/3/0/8/130814200/terms.htmlIn PDF document text
    • http://kyflowernseed.com/uploads/1/3/0/8/130814200/dmca.htmlIn PDF document text
    • http://kyflowernseed.com/uploads/1/3/0/8/130814200/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bakovenorow.files.wordpress.com/2020/06/gidumasiveporexisi.pdfIn PDF document text
    • https://ranazibug415793248.files.wordpress.com/2020/06/19661733676.pdfIn PDF document text
    • https://dawedigukas920094907.files.wordpress.com/2020/06/fageb.pdfIn PDF document text
    • https://gerujusi.files.wordpress.com/2020/06/58896502982.pdfIn PDF document text
    • https://goladosi.files.wordpress.com/2020/06/45821734997.pdfIn PDF document text
    • https://jakusenugus.files.wordpress.com/2020/06/xavifu.pdfIn PDF document text
    • https://dofanadidam.files.wordpress.com/2020/06/mumifotodatewuxuwezotafad.pdfIn PDF document text
    • https://naxolobixunu.files.wordpress.com/2020/06/74148384018.pdfIn PDF document text
    • https://kunomadud523001427.files.wordpress.com/2020/06/viwelijataduk.pdfIn 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 1

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D0A 10320 bytes
SHA-256: 27033d701bc835e131914929a2fe31730e16075a1fa1ce313fee5d93bc2e9f86

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