Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aae88dcdbae05f2…

MALICIOUS

PDF

42.0 KB Created: 2020-03-09 13:44:58 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cf33d6f306a81adfa8167eb7c36ad7b3 SHA-1: 78730c4a3d79abd563a5103fe0584ac561fb4d7f SHA-256: 5aae88dcdbae05f29cd5ca3cd39a03e6735c7944bb8fece36f1a57ac47d17b9a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by an ML classifier as malicious. It contains a large number of external links, many of which point to other PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The document body, though partially corrupted, contains a reference to 'Tp link wireless n access point manual', which is likely a lure to entice users to click on the embedded malicious URLs. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to potentially malicious content.

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://host244.carmichaelnl.com/uploads/1/3/0/7/130739301/130739301.html#tp+link+wireless+n+access+point+manual
    • http://solverbi.com/uploads/1/3/0/2/130289690/8249298.pdf
    • http://www.amyfasey.com/uploads/1/3/0/8/130814601/falamazifibowexewe.pdf
    • http://africa-food.com/uploads/1/3/0/3/130379194/5107787.pdf
    • http://www.thewheeldeals.com/uploads/1/3/0/9/130969220/317fe9.pdf
    • http://proceduralpixel.net/uploads/1/3/0/7/130739218/4932163.pdf
    • http://muskokagrandview.com/uploads/1/3/0/4/130489572/1df38c.pdf
    • http://michaelbluejay.org/uploads/1/3/0/6/130621946/sinaxuguv.pdf
    • http://warrencountyoptimists.com/uploads/1/3/0/4/130436441/wezemu.pdf
    • http://www.delicatelybeautifuldesigns.com/uploads/1/3/0/7/130776331/d9afb3f0fc2f0.pdf
    • http://familyhomesforseniors.ca/uploads/1/3/0/7/130775516/3b2d5c4994.pdf
    • http://nano-technique.com/uploads/1/3/0/6/130604524/6205811.pdf
    • http://www.wardog.us/uploads/1/3/0/3/130379479/luvavipodivuwe-lobujoso.pdf
    • http://maydaypress.net/uploads/1/3/0/7/130775167/5305602.pdf
    • http://www.girltalkempowerment.org/uploads/1/3/0/2/130289784/duwokamuraxen.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/
    • http://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d36.bin
2e773e8e244ad094cdf0afd0e97d27bbd2065c8288a7fadc20e2e127a82a7b77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D36 8128 bytes
font_01_sfnt_off00008c86.bin
3b2441b63b4f20bbc0606f1c2771d4fa72eb82cfef75297c7870c685f3836417		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C86 4360 bytes

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