Malicious PDF — malware analysis report

Static analysis result for SHA-256 10afc986a29fedc6…

MALICIOUS

PDF

53.5 KB Created: 2020-03-10 13:38:01 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e73cda46b24915a2325835ad271dd194 SHA-1: 17536b473404a754a1a60c03f9f95068b0e07399 SHA-256: 10afc986a29fedc69610e1b89df74bc1cd2ec70bfe8c86c593cc77dc0c1e0794
136 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing numerous external URLs pointing to other PDF files hosted across various domains. The ML classifier strongly indicates maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm. While no scripts were extracted, the sheer volume of outbound links suggests an attempt to manipulate search engine results or distribute malicious payloads indirectly.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oj478.slpny.com/uploads/1/3/0/2/130291689/130291689.html#crystalline+and+amorphous+solids+uses
    • http://taobaodazaobaokuandefangfa.thesurge.cc/uploads/1/3/0/7/130776474/c74548.pdf
    • http://cpanel.eacdesign.ca/uploads/1/3/0/6/130621464/3012503.pdf
    • http://truelightnj.com/uploads/1/3/0/3/130312929/gikonofifa.pdf
    • http://dorothynellcraft.net/uploads/1/3/0/7/130776196/zalariguvilelob.pdf
    • http://losangelescommercialpropertymanagement.com/uploads/1/3/0/6/130620232/8983079.pdf
    • http://valgusreklaamid.ee/uploads/1/3/0/3/130323641/lofab_zuwifov_xuwopo.pdf
    • http://malachany.net/uploads/1/3/0/3/130313198/pataxetumo.pdf
    • http://nataliesnutrition.ca/uploads/1/3/0/6/130605383/8714714.pdf
    • http://bb-lash.com/uploads/1/3/0/2/130272390/2322978.pdf
    • http://www.whiteboyconstruction.com/uploads/1/3/0/7/130740364/lelobarutedugij_jokaxuneneve_vasuvagozuvesu.pdf
    • http://saltyrein.com/uploads/1/3/0/7/130776674/8433006.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009a3d.bin
149df03a3f55a4cf688114f9405d357b4994ab05f733164528687bf38074adfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A3D 8564 bytes
font_01_sfnt_off0000baee.bin
b91489a7a89cc7211b1a76bb66c18d01c5646018cb050fc42eac6044daeed8be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAEE 4380 bytes

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