Malicious PDF — malware analysis report

Static analysis result for SHA-256 c137c48e5b9f396b…

MALICIOUS

PDF

52.5 KB Created: 2020-05-23 05:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d60642354e6d98887b49d73eb3a8588d SHA-1: 256704b3d41b356005bb2abebb00288a7618cf72 SHA-256: c137c48e5b9f396b27853d82eb2685c5a26e3babbc753aeac53fd7bf15ffa26a
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or a redirection scheme designed to lead users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://reconsanctuary.org/uploads/1/3/0/3/130323659/130323659.html#siyah+ay+yildizli+bayraklar
    • http://ccbtrustyourbuddy.net/uploads/1/3/1/4/131438456/5272392.pdf
    • http://darksidesilver.com/uploads/1/3/1/4/131453784/a6d1044a.pdf
    • http://kuolcatsavings.com/uploads/1/3/0/4/130489168/rinizanazeledex.pdf
    • http://dayspringtoday.org/uploads/1/3/1/6/131607635/c36f2.pdf
    • http://quantumjay.com/uploads/1/3/0/7/130775554/foredatatasofesevux.pdf
    • http://launchwellnesslearning.com/uploads/1/3/1/1/131164447/2d1d3fb86e17da.pdf
    • http://mysnarkmarks.com/uploads/1/3/0/8/130813514/b256b9fb34b183.pdf
    • http://adamstrucking.info/uploads/1/3/1/6/131637333/gujinebur_pawedoj.pdf
    • http://six-o-one-events.com/uploads/1/3/0/7/130775542/2974120.pdf
    • http://yogaphysiosydney.com.au/uploads/1/3/0/4/130476277/d2071e6.pdf
    • http://howevermanydays.com/uploads/1/3/0/6/130620887/jovonaz.pdf
    • http://pomskybreeder.com/uploads/1/3/0/5/130588633/ea426fb.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_off0000865a.bin
a922513424d3346addf4efcac2f410e876285318b443c472ece13a4136ab7255		 pdf-font-stream PDF embedded font (sfnt) at offset 0x865A 12668 bytes
font_01_sfnt_off0000ad14.bin
bc3ef9f71b89df04686dd0a3c4d9562793755b0c4868966820c4d9a556dddc30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD14 16808 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.