Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bcc27498964701…

MALICIOUS

PDF

36.2 KB Created: 2020-06-14 16:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e65598fbaf1bd5686c542b10bef2c71b SHA-1: 62dbe03e8aff0301a64865a557b0331a423942cc SHA-256: 91bcc274989647016c7c47fbbba438b7c557ef79fca46d019f6f8a80a4cbf170
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, many of which appear to be part of a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample.

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://theworldplaylist.com/uploads/1/3/1/0/131070581/131070581.html#perimeter+and+area+of+complex+figures+4th+grade+worksheets
    • http://earnmoneyonlinematchedbetting.com/uploads/1/3/1/4/131454151/6bdcf66.pdf
    • http://scoopsmunchiesnmore.com/uploads/1/3/0/7/130738909/xotixitovudodejasevu.pdf
    • http://enchantebyluminous.com/uploads/1/3/1/3/131384021/11aeb02e0339.pdf
    • http://lorenzocaceres.com/uploads/1/3/0/4/130477372/6592353.pdf
    • http://crossfitattain.ca/uploads/1/3/0/9/130969885/ae1c521557fa3f.pdf
    • http://stardustandstones.com/uploads/1/3/0/5/130589132/rabipove-basub.pdf
    • http://she-racreations.com/uploads/1/3/0/8/130873855/xerenetofeduk_guzatime_fuwow.pdf
    • http://nationalcrossday.com/uploads/1/3/0/8/130874067/4987362.pdf
    • http://rockymountainpsych.org/uploads/1/3/0/5/130588556/mexoveseraj.pdf
    • http://cleekhcomm2034su19.com/uploads/1/3/0/8/130874326/vepesiwuz_bojijuze_mirukif.pdf
    • http://rafurnitureonline.com/uploads/1/3/0/5/130542728/5451264.pdf
    • http://tiffanyetfleurs.com/uploads/1/3/1/3/131381003/f81332f1.pdf
    • https://lebetamawif.files.wordpress.com/2020/06/zufuwenunuli.pdf
    • https://perukawapowe.files.wordpress.com/2020/06/63356696410.pdf
    • https://polobepokug.files.wordpress.com/2020/06/30583430151.pdf
    • https://jagakegu.files.wordpress.com/2020/06/ditifinowukipudo.pdf
    • https://madatovo.files.wordpress.com/2020/06/vilokumumusuvaxumutuv.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e79.bin
d1daae9733796c35d2e5f87732a8c7231230af8782caa52c639288b37ac0a415
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E79 9480 bytes
font_01_sfnt_off00006f14.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F14 16204 bytes