Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f85d92a0931537d…

MALICIOUS

PDF

37.9 KB Created: 2020-04-19 06:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c75701d70e713336c92e0ddc572e01b3 SHA-1: 19ab0c6ba7f8488c968aa831da28e50e58dca20c SHA-256: 0f85d92a0931537d70c9e1d37220752c99074e7d4f3b4500789571ad430781be
96 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs further supports this assessment. No scripts were extracted from this sample, but the sheer volume of outbound links is a significant indicator of malicious activity.

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://lichenconsulting.ca/uploads/1/3/0/8/130813961/130813961.html#laboratory+technician+duties+and+responsibilities+pdf
    • http://praxisdoktorjaeger.de/uploads/1/3/1/3/131383928/f162fdb30b.pdf
    • http://meadowsoneloudoun.com/uploads/1/3/0/4/130489465/8f6034d.pdf
    • http://jbyogameditation.com/uploads/1/3/0/5/130541677/rapovejibiror.pdf
    • http://jailz.org/uploads/1/3/0/6/130639393/dixamajesofo-xofemova.pdf
    • http://mycoolidea.net/uploads/1/3/0/4/130483050/sixuxaju.pdf
    • http://oceanpoolsplastering.com/uploads/1/3/0/5/130589035/474c0f2ccd.pdf
    • http://cloudbenders.shop/uploads/1/3/1/0/131070198/3977399.pdf
    • http://chynomusic.com/uploads/1/3/0/6/130604049/zanef.pdf
    • http://sandranewtontextiles.com/uploads/1/3/1/0/131070518/d0e1428f8fb8aa.pdf
    • http://dinodini.com/uploads/1/3/0/9/130969876/dukure-limunon-gorevurokiv-niwewabej.pdf
    • http://zitomerlawoffices.com/uploads/1/3/0/8/130874377/lagibulexino-zurono.pdf
    • http://571cafe.com/uploads/1/3/1/1/131163991/wurikubabuki.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_off0000695a.bin
1549198bb2433156afeb5c4bcb3638389f9cbf07057122cded7d4945ecd76e84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x695A 8392 bytes

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