Malicious PDF — malware analysis report

Static analysis result for SHA-256 5995c3df13bacecc…

MALICIOUS

PDF

78.1 KB Created: 2021-04-28 12:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 79c00a1d3cb4a6413bcd6b40e39fbd7f SHA-1: d4f42d93f87bbe09608abe970913c42484409190 SHA-256: 5995c3df13bacecc5a317a8a5ef092cb9c4a7357bfa5488cded9d7090357f92b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=starbucks+coffee+mug+holiday PDF link annotation
    • https://mifesala.weebly.com/uploads/1/3/2/6/132683173/8738831.pdfIn PDF document text
    • https://pafebexazare.weebly.com/uploads/1/3/1/1/131163914/57a389c1a.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/igijlC9/xovola.pdfIn PDF document text
    • https://ligexuvuzi.weebly.com/uploads/1/3/0/8/130814340/934b7d46a99f95.pdfIn PDF document text
    • https://cdn.sqhk.co/xeliwiwogivo/g3eiixb/hearthstone_battlegrounds_rating_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvuvidova/5jaJBii/middle_finger_emoji_keyboard_apk_download.pdfIn PDF document text
    • http://nefovirarud.iblogger.org/wire_transfer_instructions_form_template.pdfIn PDF document text
    • https://wurilulisewanid.weebly.com/uploads/1/3/4/7/134728532/6713821.pdfIn PDF document text
    • https://lukigozijejis.weebly.com/uploads/1/3/5/3/135398738/7165977.pdfIn PDF document text
    • https://xajowaluvuro.weebly.com/uploads/1/3/5/3/135303047/149251.pdfIn PDF document text
    • https://cdn.sqhk.co/koxopumo/JlhcjaJ/sweatcoin_walking_step_counter_and_pedometer_app.pdfIn PDF document text
    • https://duresanu.weebly.com/uploads/1/3/5/3/135334900/saledevubifexepese.pdfIn PDF document text
    • https://volamajujidek.weebly.com/uploads/1/3/4/6/134667755/lawigig_fifuvokili_fepaduw_zisufenipag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/212e0f6b-22b9-4125-8cd8-69960599e7ca/battle_angel_alita_mars_chronicle_manga_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8039cd2-8e04-445b-abf5-2875c6307630/zufukiv.pdfIn PDF document text
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_07db420fb1b444fd869862f3afdeade4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2492225f-4baf-4874-aad9-502ab96e7313/95735692236.pdfIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_eac80238cda7424897ecbdfa375feed7.pdf?index=trueIn PDF document text
    • http://xujufogovixew.epizy.com/stephen_king_it_free_movie_online.pdfIn PDF document text
    • http://rosuronuvure.epizy.com/62801494009.pdfIn PDF document text
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_1d9009af4d7d4d89b7b673841fe78ec9.pdf?index=trueIn 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_off0000f2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 5844 bytes
SHA-256: 1fdceffa549e76991c5d55781f821dee1fe6bd2ec451499491ebf0edca786a5f
font_01_sfnt_off00010672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10672 10256 bytes
SHA-256: 4381aaceaffdf216e988d0ccfbadb76fcf86b435171522e062193c00806bcb7e