Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f01463cf2f6d2b…

MALICIOUS

PDF

30.8 KB Created: 2020-03-23 06:40:00 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 16fcd9951e39990b6b54c861f637d5f2 SHA-1: 44a64dff628734f204ff08d6125db969138a992f SHA-256: 65f01463cf2f6d2b2a6e56f6b0e303cad31f82a67b4a0286da99a82f886cf523
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by an ML classifier and contains a large number of external links, indicative of a link farm or SEO spamming technique. The primary purpose appears to be directing users to potentially malicious or deceptive content hosted on various domains. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of specific user lures.

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://heinzbarthel.com/uploads/1/3/0/7/130740206/130740206.html#advantages+of+mixed+method+research+design+pdf
    • http://www.83constructionllc.com/uploads/1/3/0/7/130739192/406468.pdf
    • http://www.creativeconsultingsolutions.org/uploads/1/3/0/6/130639763/sitemu.pdf
    • http://majesticmousepads.com/uploads/1/3/0/9/130969353/diwita.pdf
    • http://radonchamber.com/uploads/1/3/0/5/130551880/kokabepine.pdf
    • http://andrewthompsonsongs.com/uploads/1/3/0/5/130547999/zawob-vutuzovanix-kevidivefiravex.pdf
    • http://myskiped.com/uploads/1/3/0/5/130542813/6500a4b7fcc4.pdf
    • http://cozmomcares.com/uploads/1/3/0/6/130621351/97cc198.pdf
    • http://www.amandasdigitalbinder.com/uploads/1/3/0/5/130588268/b31be62013bc.pdf
    • http://aclifesciences.biz/uploads/1/3/0/6/130640031/suwedonot.pdf
    • http://kisteherautoberleshmv.com/uploads/1/3/0/7/130775384/78219.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_off00005482.bin
274e43068563d9186af5d3ce9f861396b1f8e21227d9ee37387c02237497a64e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5482 6464 bytes

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