Malicious PDF — malware analysis report

Static analysis result for SHA-256 45cb6da944e08d7a…

MALICIOUS

PDF

61.9 KB Created: 2020-06-19 03:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 634ad9b89028174fcc636ba4a135ca39 SHA-1: 758169baf35b6ef75ff9619a5b086206bc160eb4 SHA-256: 45cb6da944e08d7ab5509c7018b3ced8745dfe4b0455c48d195f747d8c028492
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains text related to 'medical surgical nursing book' and references the wkhtmltopdf tool, indicating a deceptive lure. The primary attack pattern involves redirecting users to a network of external websites, likely for malicious purposes such as phishing or malware distribution.

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://brightstarastro.com/uploads/1/3/0/9/130969681/130969681.html#pdf+medical+surgical+nursing+book PDF link annotation
    • http://saratogaveganfestival.com/uploads/1/3/1/0/131070089/3679992.pdfIn PDF document text
    • http://ns.ninemillionbicycles.com/uploads/1/3/0/2/130287737/8e8b2b7e2ae.pdfIn PDF document text
    • http://hostmaster.jessicamaytaylor.co.uk/uploads/1/3/1/0/131070597/vanuzepapamasilonu.pdfIn PDF document text
    • http://seamlesscarpet.com/uploads/1/3/0/6/130640145/f22aad.pdfIn PDF document text
    • http://bunnuhealing.com/uploads/1/3/0/6/130639098/pejipekeme-givexuguvatut-benipojidawe.pdfIn PDF document text
    • http://hostmaster.adacateringequipment.co.uk/uploads/1/3/0/7/130738785/nixebi.pdfIn PDF document text
    • http://theyoungwomenssteamacademy.com/uploads/1/3/0/7/130738847/9125333.pdfIn PDF document text
    • http://punachambers.designpreviewer.com/uploads/1/3/0/7/130738914/5207465.pdfIn PDF document text
    • http://blackbirdrosietarot.com/uploads/1/3/2/6/132695492/wagur.pdfIn PDF document text
    • http://scrubs4work.com/uploads/1/3/0/6/130604636/020b853be5ce8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5B7 5348 bytes
SHA-256: 8a4c27d3c51584ba886313b2d9dbb92afe9cac45d892ee24a954247f4a1dcc9d
font_01_sfnt_off0000b7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B0 2272 bytes
SHA-256: c123cb739922054b2222d91fdd7f2aa2f14c60f003a2913222fa7a5627268825
font_02_sfnt_off0000c18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18D 12124 bytes
SHA-256: f086e4103466d3e481422cd96703f0b92fd0871d3f6263716408c5a27c18b084

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