Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d9ae7daf2ee1bd0…

MALICIOUS

PDF

85.1 KB Created: 2021-04-21 22:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ac12d571c5837586b656940feb6612e6 SHA-1: 2d17439edc7212e7c2989fa07025c5557d5e45d6 SHA-256: 6d9ae7daf2ee1bd036e63418820aba5f6e46bfe5e6ec1a5dfd7cbd67b0f21f97
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 and using UTM parameters, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting. While no scripts were extracted, the structure and numerous external URLs suggest the document's primary purpose is to redirect users to potentially malicious or deceptive 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://lozipotod.ru/strik?utm_term=magazine+score+foothills PDF link annotation
    • http://valuburikodajad.medianewsonline.com/the_great_depression_causes_and_solutions_worksheet_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzojivemepe/hgVWfib/guideone_specialty_mutual_insurance_company.pdfIn PDF document text
    • http://xupoluwifokolo.22web.org/sizibegixunutegunu.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/who_sells_yardman_riding_mowers.pdfIn PDF document text
    • https://cdn.sqhk.co/najiligopej/ijihihj/tattoo_designing_game.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/ahcia4c/addons_for_minecraft_pe_website.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_4233b02f3cb04a7da31189f1278f822c.pdf?index=trueIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_6ea5ba921efc447fbd7ea12aafd40c59.pdf?index=trueIn PDF document text
    • https://e905e09d-7ddd-4aab-833c-73500e817873.filesusr.com/ugd/f4c08b_010db817e7f14afdb8e1dc10ffcad370.pdf?index=trueIn PDF document text
    • https://45f0f727-c607-4398-b3b7-8b42e23b21b2.filesusr.com/ugd/0a84ca_4a5421d75daf40148f6c00f09e984021.pdf?index=trueIn PDF document text
    • https://a0758896-f8c2-4fc9-8c7e-5c1738e8bc18.filesusr.com/ugd/0ce882_49f3a2545bfd47adb1ca4d73cc9ab216.pdf?index=trueIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_7cdb124110b74b13b8c63d01557ce924.pdf?index=trueIn PDF document text
    • http://zuwarikufaz.epizy.com/beachbody_performance_energize_and_recover.pdfIn PDF document text
    • https://6438efa2-cbc3-4905-bec7-85cdafd94a34.filesusr.com/ugd/d1cf8b_e36a340c35584c82a9a383f7181544d2.pdf?index=trueIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_e1c636041f384161b7a405b8d096e3b9.pdf?index=trueIn PDF document text
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_2ddc4fcf67984bc7b4eab0dcde0cde07.pdf?index=trueIn PDF document text
    • https://3796e7af-74f6-4269-b4b1-c98d6d9a2df3.filesusr.com/ugd/169b5e_018cded8115d477a8d3ec221af7ab43b.pdf?index=trueIn PDF document text
    • http://navezep.epizy.com/answer_maths_questions_online_free.pdfIn 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_off00010bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB6 5196 bytes
SHA-256: 50b88a37b1835a9b214702c367ab163c6a07d9a4da5bef96c2c5a18fc4386b35
font_01_sfnt_off00011d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D78 12140 bytes
SHA-256: 6f5d5aa83b575b4b1ee4c2c8b80dbb6e541e9d4610e4e11187e12018092de430

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