Malicious PDF — malware analysis report

Static analysis result for SHA-256 3212651a3f3f7cd1…

MALICIOUS

PDF

74.2 KB Created: 2021-04-07 00:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa7445ab925023bd10365e28290f82d3 SHA-1: 25570fa34121a5a05fe44a3d5acc16e0ea426000 SHA-256: 3212651a3f3f7cd1e06cabfeafe4d7866b08311498c549ff858aef749635053f
186 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with a significant number pointing to potentially untrusted domains. The PDF_SEO_LINK_FARM heuristic suggests the document's primary purpose is to generate traffic or distribute links, often associated with SEO manipulation or phishing schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 https://druttle.ru/wix?keyword=population+ecology+graph+worksheet
    • https://cdn.sqhk.co/xabovalizo/DeyidMz/the_triple_entente_included_what_countries.pdf
    • http://motarojetox.sportsontheweb.net/brother_ls_1217_extension_table.pdf
    • https://kidamevu.weebly.com/uploads/1/3/1/4/131437276/8113995.pdf
    • http://zibodotuf.mygamesonline.org/bokufisaruzibofesa.pdf
    • http://misujupino.getenjoyment.net/kugoximolodekumisovezovub.pdf
    • https://cdn.sqhk.co/pigajifaw/T5URjcM/piluzex.pdf
    • https://koditagonuxu.weebly.com/uploads/1/3/5/3/135339835/kagatobafetevab-genabudorup-vuwevufobamob.pdf
    • https://cdn.sqhk.co/dugixikisim/mIidOie/piggy_bank_model.pdf
    • https://cdn.sqhk.co/bobavijiwoba/fJghBhf/pagugub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f7b0ef4b-317e-4f07-901b-4de91a029b50.filesusr.com/ugd/50f142_c7b8662d34f44e16a061ddb853d7ea0f.pdf?index=true
    • https://52b03d57-94e3-497b-b2ee-5a576b8f136c.filesusr.com/ugd/67ae49_6c6bc99d1842420c922a6b5c20953bc1.pdf?index=true
    • https://s3.amazonaws.com/xonaxevetaf/salary_slip_template.pdf
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_433c0e40881a4c838135c9a06ca5522d.pdf?index=true
    • https://3c3713de-992c-4571-92b4-00afcb8cb2c1.filesusr.com/ugd/9dbdb2_39f2e802b65b4d7abcbaf72c404b7fbd.pdf?index=true
    • http://bavatesivo.myartsonline.com/wevixokawupumadelatifel.pdf
    • https://e9155d39-0f7d-4366-9ee8-34e17fe3d773.filesusr.com/ugd/9e05b8_d84dcfcee8514df7a6fcd19153b2608d.pdf?index=true
    • https://s3.amazonaws.com/gezetega/compulsion_movie_2016_parents_guide.pdf
    • https://42cc6f6d-9125-48bc-bce4-1bf15f49b1be.filesusr.com/ugd/7c30af_ac6ad0f082cc43568afcc15b63745f56.pdf?index=true
    • https://d2d110b1-dce0-4b0c-bed7-be24280b7a6e.filesusr.com/ugd/165585_ecf30caf00234f508422daa039503b4b.pdf?index=true
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_9ed2f34573314516957b2eed1a2bf439.pdf?index=true
    • https://s3.amazonaws.com/jijumupade/kanuwuvolodura.pdf
    • https://s3.amazonaws.com/batoragubukepo/burning_wheel_gold_play_sheets.pdf
    • https://s3.amazonaws.com/wavunot/logo_intro_template_premiere_pro.pdf
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_2be42a17abcb4495a9b9260cac7bcecd.pdf?index=true
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e481.bin
0fe425115a4de81f37a420e375519903c03032f629699626d3c7b5cd7f5cf636		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE481 5452 bytes
font_01_sfnt_off0000f71a.bin
e44f1d893dd5c2b9014861df772db6281e1a04b55be6c7b113491f7e47402a68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF71A 10548 bytes

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