Malicious PDF — malware analysis report

Static analysis result for SHA-256 50987f86de0dfc7b…

MALICIOUS

PDF

44.2 KB Created: 2020-04-01 13:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1de25d49e0119780de8fc18ad0316ee7 SHA-1: 96b8e7805eb17fdebacfd8fa2d0aa536d2803288 SHA-256: 50987f86de0dfc7b5850f4f364d3b7a77fde871e36ddd6c50a6bdce925a11ed5
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, many of which are numerically or generically named and hosted on unrelated domains, indicative of a link farm or SEO spam tactic. The document body, though partially corrupted, contains text related to university transfer deadlines, suggesting a lure to direct users to these external sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://wellwithacupuncture.com/uploads/1/3/0/8/130874198/130874198.html#cu+boulder+transfer+deadlines
    • http://sienahoefling.com/uploads/1/3/0/4/130483836/jikenuzit.pdf
    • http://dbpstockfootage.com/uploads/1/3/0/6/130603721/e0fd7c.pdf
    • http://www.harberer-wedding.rominastiebenphotography.com/uploads/1/3/1/3/131384667/lujasumali.pdf
    • http://avonlakevisualart.org/uploads/1/3/0/7/130740568/5216327.pdf
    • http://onehangryorson.com/uploads/1/3/1/4/131453302/vupigogafakaz.pdf
    • http://lifeinchristfellowship.org/uploads/1/3/0/5/130588251/xejataj_vuriwawowokuzo_biwete.pdf
    • http://purelightyogaschool.com/uploads/1/3/0/5/130550961/nuwixudefux_jigejofebid_guxagipokukafej_ribitagewawal.pdf
    • http://ldsstrangite.org/uploads/1/3/0/5/130539642/fb4eef042c25fd.pdf
    • http://hostmaster.mi-ete-st-cergue.ch/uploads/1/3/0/7/130775490/nofevixala.pdf
    • http://localcoffeeman.com/uploads/1/3/1/3/131384400/8816837.pdf
    • http://danojose.com/uploads/1/3/0/7/130740538/xejenede.pdf
    • http://formula1noni.ca/uploads/1/3/0/6/130621956/bowenobuful-rewofuxogop-zefakezos-sikobitumi.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_off00008553.bin
03dd305f086c29326c342bc92ab1d8a56300d47fc27de68519d4334b68a9cc38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8553 7844 bytes

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