Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5db022cd2496dff…

MALICIOUS

PDF

76.2 KB Created: 2021-02-19 23:20:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 55410d3fe5d6d2b47656dd1fd3286f6b SHA-1: 5838eeaf48c7714a0dbfa8787009c29938aa06de SHA-256: c5db022cd2496dff5ae31d48ebdef150f3b9d4a74b0e42fb9eb00f3bc9d02359
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains, which is characteristic of SEO link farms or content distribution networks for malicious files. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports the conclusion that this document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://jacksth.ru/wix?keyword=dericam+user+manual PDF link annotation
    • https://cdn.sqhk.co/sotatixorawi/iagjJdh/10908634878.pdfIn PDF document text
    • http://sqrab.top/509426559357k3rt.pdfIn PDF document text
    • http://cmb-societe.com/allok_video_converter_for_computerikvi5.pdfIn PDF document text
    • http://8gusevshop.space/segmentacion_de_mercado_philip_kotlerhokl1.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/hfhjiaR/forgotton_anne_switch_test.pdfIn PDF document text
    • http://lavka-karamel.ru/que_significa_bbva_bancomer_en_siglaswios3.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/bhejcRG/bud_farm_grass_roots_glitch.pdfIn PDF document text
    • https://cdn.sqhk.co/lonuxonemor/jegchcR/death_race_machine_gun_joe.pdfIn PDF document text
    • http://afracheat9.xyz/kerboodle_answers_chemistry_aqa_a_level4e3b4.pdfIn PDF document text
    • http://abzac.me/aristotelian_syllogismzcbe2.pdfIn PDF document text
    • https://cdn.sqhk.co/jadojibam/bWIziij/dragon_evolution_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/pihjjhl/flying_monkey_portsmouth_nh.pdfIn PDF document text
    • http://opticsystem.website/18360932097ppqdw.pdfIn PDF document text
    • http://pmaider.com/30583346675rirn5.pdfIn PDF document text
    • https://cdn.sqhk.co/gilubibawi/sibje76/company_of_heroes_2_ardennes_assault_wiki.pdfIn PDF document text
    • https://xavujome.weebly.com/uploads/1/3/0/7/130739328/f6fa2d912b748.pdfIn PDF document text
    • http://secureappeal.com/lizilepimupegunonutiokxtk.pdfIn PDF document text
    • https://cdn.sqhk.co/dipujabuxiw/gg2ZWhe/optical_illusion_rug_stairs.pdfIn PDF document text
    • http://i12tws.website/54162700267uferg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECC 4944 bytes
SHA-256: dbc25aa8174fa346db1ead3d1ec262789ddefd6cee465724a7f0101479df2bf1
font_01_sfnt_off0000ff89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF89 10588 bytes
SHA-256: ec3b1c2f37aeff052c3d775bcd7ec808d3f9f990362ac946ffbc9d27e23f5803

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