Malicious PDF — malware analysis report

Static analysis result for SHA-256 d63ea77139489fc5…

MALICIOUS

PDF

41.7 KB Created: 2020-04-02 01:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: db8da5191e4a05a499074d8a3db9855b SHA-1: 4bd2aed45e9da7bbd5d4419bca3d0ed8675617aa SHA-256: d63ea77139489fc5d29e674061d71dc528f1b1a649d43ccf2f67f52f9549de9c
94 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicating a link farm or SEO spamming attempt. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains references to URLs that are also present in the list of extracted URLs, suggesting these are the intended destinations. The primary attack pattern involves redirecting users to a large number of external PDF files hosted on various domains.

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://iavnt.com/uploads/1/3/1/3/131380730/131380730.html#concepto+de+estudio+legal+de+un+proyecto
    • http://my-adolphus-uil.com/uploads/1/3/0/7/130739313/142d734b1ae8.pdf
    • http://nazga.org/uploads/1/3/0/4/130483447/8011883.pdf
    • http://coppersite.com/uploads/1/3/0/3/130379381/poponok.pdf
    • http://thesouthshorecookingco.com/uploads/1/3/1/0/131071315/tubematu_wixaxiraveb_wulixuf.pdf
    • http://dianehunterart.com/uploads/1/3/0/7/130740084/lemov-lakarunome-koxifokosilen-lajumugaguz.pdf
    • http://disastersupply.org/uploads/1/3/0/5/130588672/mugop_sedelixapogij_solelogowujuka_rigof.pdf
    • http://derekcjr.net/uploads/1/3/0/5/130551019/wopimokogu.pdf
    • http://knowledgebusinessblueprint.club/uploads/1/3/1/0/131071183/xigifebifafosog.pdf
    • http://dnmlr.com/uploads/1/3/1/4/131411088/deritaxafidu.pdf
    • http://brittanyaholmes.com/uploads/1/3/0/4/130483678/wonewig.pdf
    • http://skyhutchison89.com/uploads/1/3/0/4/130488357/ec2d49b48.pdf
    • http://card-on-blue.com/uploads/1/3/0/6/130620537/4c7af2576a21a.pdf
    • http://thehottestmusic.com/uploads/1/3/0/5/130589031/e4c0b5.pdf
    • http://enerwatts.com/uploads/1/3/0/4/130483286/4e97532d900559.pdf
    • http://hewlettacademy.com/uploads/1/3/0/2/130272501/8373689.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_off00007864.bin
5fc440a2a7e4b95cc8602bede55c7b98c3afeea165c14e3da937f18218127de8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7864 8680 bytes

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