Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff5c98a567a3542…

MALICIOUS

PDF

49.6 KB Created: 2020-03-07 23:40:37 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e39ebc14b5d4167417dfdb049e2e815a SHA-1: e0c0acc8a2e4baccff2c3566b8a657052890f17a SHA-256: fff5c98a567a3542b4791fc5149547bf5cf20dfcd3b3db97af8874e224e2b21e
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The document body, though partially corrupted, contains text related to downloading a PDF, and one of the extracted URLs is "http://0abe.brdge.org/uploads/1/3/0/9/130969963/130969963.html#irregular+verbs+list+with+tamil+meaning+pdf+download". This indicates a social engineering attempt to trick users into downloading further content. The ML classifier strongly flagged this PDF as malicious.

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://0abe.brdge.org/uploads/1/3/0/9/130969963/130969963.html#irregular+verbs+list+with+tamil+meaning+pdf+download
    • http://www.lostonmars.com/uploads/1/3/0/8/130814714/dovatuvi-rirojodotovi.pdf
    • http://waroncreditcards.com/uploads/1/3/0/5/130589131/vukifeja.pdf
    • http://prinseshaar.site/uploads/1/3/0/5/130588475/4fc8b3683d5c.pdf
    • http://mrmacbible.org/uploads/1/3/0/6/130622063/vurififefisidok-pezozodekak-lijekutoj.pdf
    • http://jazminequill.com/uploads/1/3/0/5/130546209/2917689.pdf
    • http://supersecretprojectx.com/uploads/1/3/0/2/130270775/rafabobotufuxuv.pdf
    • http://8change.org/uploads/1/3/0/5/130543065/3aa8441a357f487.pdf
    • http://yemenicoffeeboard.org/uploads/1/3/0/4/130489006/8729164.pdf
    • http://sloaneswayze.com/uploads/1/3/0/3/130379065/4226822.pdf
    • http://jstoneman.com/uploads/1/3/0/7/130740199/0ef0eedf.pdf
    • http://www.internationallawyermoves.com/uploads/1/3/0/4/130489131/popurozawazada-pafatigomurog-bagimow-worutum.pdf
    • http://nateslz.com/uploads/1/3/0/5/130545327/mixobovogit.pdf
    • http://prinseshaar.site/uploads/1/3/0/5/130588475/4fc8b3683d5c.p
    • 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_off000069ce.bin
ad8646c587cb422741dcca9fb79b9fbe0e2a5a35393410391be9c17ba4a805d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69CE 17776 bytes
font_01_sfnt_off00009ab0.bin
739be50bab288574a23280028869e46c4b6d08503ad962055323c0caffecc93d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AB0 7752 bytes

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