Malicious PDF — malware analysis report

Static analysis result for SHA-256 3422d2416f363985…

MALICIOUS

PDF

37.4 KB Created: 2020-04-08 23:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5e71a85a25734d1a3bc5ec2bcc18f399 SHA-1: 8b6177af112df92f37e0bd76f7cb9df42fd56ee0 SHA-256: 3422d2416f363985624c5bcef1cbe8fb67c1cba9a3e816f4a2e89f98aa082b12
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or a method to distribute malicious content indirectly. The ML classifier also strongly indicated maliciousness.

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://mightypharaoh.com/uploads/1/3/0/5/130545382/130545382.html#statics+and+mechanics+of+materials
    • http://kellyjoboyd.com/uploads/1/3/0/7/130739894/296f2e53ea8800.pdf
    • http://chelseahadd.com/uploads/1/3/0/8/130813957/7088445.pdf
    • http://naiebang.org/uploads/1/3/0/8/130874376/gumuda-xoligumuwo-tapobukunanabaw-galaxato.pdf
    • http://tuliptreeyarn.com/uploads/1/3/0/7/130775969/1055109.pdf
    • http://llr-t1-coms.com/uploads/1/3/0/7/130775837/mupisebo.pdf
    • http://metsalinja.com/uploads/1/3/0/5/130589174/55ac492.pdf
    • http://cibailey.com/uploads/1/3/0/8/130813118/xonenikaki.pdf
    • http://syzygyservicesllc.com/uploads/1/3/0/9/130968934/ceb344.pdf
    • http://privatklinikker.no/uploads/1/3/0/2/130273983/napojawo.pdf
    • http://creationsbyshanisaandshailen.com/uploads/1/3/0/4/130435777/606d4f2cf35af.pdf
    • http://brownscarpetcare.net/uploads/1/3/0/3/130379060/kuvus.pdf
    • http://otbservices.org/uploads/1/3/0/8/130813732/dadikonulak.pdf
    • http://remoteworkers.ch/uploads/1/3/0/9/130969835/nagim-karuniw-zenudavorezuf.pdf
    • http://grammasglasses.com/uploads/1/3/0/2/130272571/kevan.pdf
    • http://foodsafetysolutionsllc.com/uploads/1/3/0/3/130313093/sojedevofexugexa.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_off00006ab4.bin
4e09f1b2dc8dd337bc897606be8cc71bb3a937a81b9417b55717880a2a03dc5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB4 7636 bytes

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