Malicious PDF — malware analysis report

Static analysis result for SHA-256 4760c15b2bd239db…

MALICIOUS

PDF

32.4 KB Created: 2020-03-31 05:40:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d91024a60deafc86b9848494d8a416df SHA-1: f1885690fe219692d4d3222736374e6eb8b07d09 SHA-256: 4760c15b2bd239db1aae568c8a21333716ded94d1d8858bca6e3a329a5a28987
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDFs hosted on various domains, a technique commonly used for SEO spam or to distribute malicious content. The ML classifier strongly indicated maliciousness. The embedded URLs and the PDF_SEO_LINK_FARM heuristic firing confirm the intent to redirect users to a network of SEO-optimized PDF files.

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://angelwellness.net/uploads/1/3/0/4/130478935/130478935.html#parrot+minikit+bluetooth+manual
    • http://matsuwholesale.com/uploads/1/3/0/2/130288465/425a029.pdf
    • http://pattiepperson.com/uploads/1/3/0/5/130588811/e4348d42.pdf
    • http://naijility.com/uploads/1/3/0/5/130588968/3523926.pdf
    • http://megbjones.com/uploads/1/3/0/6/130604902/fugogagirujegomitu.pdf
    • http://farmwifelifend.com/uploads/1/3/0/6/130640018/fipugimuma_nabuwifu_divamifunedo_diwoweviwi.pdf
    • http://mingcamellia.com/uploads/1/3/0/8/130814516/9ee1830817.pdf
    • http://rareenergyllc.com/uploads/1/3/0/7/130740089/4930169.pdf
    • http://mountainviewmealprep.com/uploads/1/3/0/3/130313243/bemer.pdf
    • http://kvbassmasters.org/uploads/1/3/0/2/130272377/wimikuwujezu.pdf
    • http://countyturfpro.com/uploads/1/3/0/5/130550708/8523519.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_off000057ef.bin
2c54196d8d2660acdada00ad452b563d09d32bd04ada8edf0a2f8d6f5767cf39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57EF 7340 bytes

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