Malicious PDF — malware analysis report

Static analysis result for SHA-256 365627fa21b4b57c…

MALICIOUS

PDF

47.7 KB Created: 2020-05-05 03:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 28ec4975dc06445ffb2a3c4b3afaf981 SHA-1: 34d6e20bdde616b8a49368ab7c79b7715cedeaeb SHA-256: 365627fa21b4b57c7613b10f07d5964a0b42f047abfd284788fa3f437cacabbb
96 Risk Score

Malware Insights

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

The PDF document contains a mass of external links, many of which are structured as SEO-friendly PDF lures. The document body mentions an 'Android 10 update for nokia mobile', which is likely a pretext to encourage users to click on the embedded links. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior.

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://marmarworld.com/uploads/1/3/0/2/130291769/130291769.html#android+10+update+for+nokia+mobile
    • http://derrelsofdothan.com/uploads/1/3/0/2/130289746/8000737.pdf
    • http://priscillasoares.com/uploads/1/3/0/6/130620454/rikap.pdf
    • http://artemiseyewear.com/uploads/1/3/1/4/131452782/xuwakeku.pdf
    • http://digitalsoftwareservices.net/uploads/1/3/0/8/130874522/pupapupoti.pdf
    • http://institutebusinessfinance.com/uploads/1/3/1/0/131070925/jidopili-sudafidefofipi-guxizomaraxi.pdf
    • http://danceswithmysoul.com/uploads/1/3/1/4/131437237/2bef0.pdf
    • http://anger-management-coach.com/uploads/1/3/0/7/130776739/jexebepuw-tafujezudake-gegiza.pdf
    • http://speechanddebatecamps.com/uploads/1/3/0/5/130539800/kefugijagemaromediti.pdf
    • http://gospeladventure.com/uploads/1/3/1/4/131408899/1077684.pdf
    • http://safetyminder.org/uploads/1/3/1/4/131453944/nimekipesixe-gopawidos-mubebesutez-wujijini.pdf
    • http://coxautoroadtrip.com/uploads/1/3/0/5/130544751/7115256.pdf
    • http://keepmovingwellness.com/uploads/1/3/1/4/131453559/tojet_lepubof_zuwezemul_faxitulijajakox.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off00008139.bin
dae0f12506c17deaa818396cb86411da2f7a72f10e575d6fda98e021880a3e82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8139 2744 bytes
font_01_sfnt_off00008ce3.bin
ea31c65c715a557d6f21d6d6eaa1e2d5360a7f66856ebe8603c7ba17b3313886		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CE3 11504 bytes

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