Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a3606b273614ce…

MALICIOUS

PDF

36.8 KB Created: 2020-03-13 04:21:57 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f5b45cc85db386422c7691f89c5d6616 SHA-1: 3178fd3bd4b1135942939eaba8c8449eeb781335 SHA-256: 44a3606b273614ce8a9d832416247f1a7e3a048789102663fcdca3df22df82a9
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a large number of external links to other PDF files hosted across numerous domains. This behavior is indicative of a link farm or SEO manipulation tactic, designed to drive traffic or artificially inflate search engine rankings. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, limiting the analysis of direct payload delivery.

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://rlunivd.brdge.org/uploads/1/3/0/4/130483912/130483912.html#passive+voice+present+and+past+multiple+choice+exercises+pdf
    • http://www.alendinghandseniorliving.net/uploads/1/3/1/0/131070006/93eb06d1.pdf
    • http://love-at-first-sit.com/uploads/1/3/0/3/130323182/93687.pdf
    • http://picturegurus.com/uploads/1/3/0/5/130588878/mezuvulo_kugagofifufe.pdf
    • http://muchagracia.com/uploads/1/3/0/2/130291485/dexulobabinuwabonaju.pdf
    • http://itinerist.com/uploads/1/3/0/6/130620791/5071899.pdf
    • http://bestmd.space/uploads/1/3/0/8/130814421/6ef6bbb636ff32d.pdf
    • http://server65089.misscarols.com/uploads/1/3/0/8/130874126/gikowex.pdf
    • http://steveweir.net/uploads/1/3/0/2/130272342/f2967d0f3c661.pdf
    • http://hostmaster.beautifulrooms.london/uploads/1/3/0/3/130379096/281897.pdf
    • http://mustaren-farmarik.sk/uploads/1/3/0/6/130621431/5426518.pdf
    • http://www.marielouisehall.co.uk/uploads/1/3/0/8/130813835/domizuxedu.pdf
    • http://juelparkdiscgolfclub.com/uploads/1/3/0/7/130739850/8734807.pdf
    • http://spark4az.com/uploads/1/3/0/2/130272600/votixame-rigawejigu.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_off0000661c.bin
0e2d2c5d8e0977b3bb2c0bbc34d03816693e0e13a91f043aaf5c048cce93a0e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x661C 7596 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.