Malicious PDF — malware analysis report

Static analysis result for SHA-256 50287994afa63a59…

MALICIOUS

PDF

80.4 KB Created: 2021-03-31 20:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 84ba59a482aa0ea7472aa61b26eb820b SHA-1: 194e55fc57d1b3e80b9c7653f9b1d3e13f6f37c0 SHA-256: 50287994afa63a590e316bb12db39cdc837d107640cc87d8b0ae2df718b4015d
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 0.9967

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://crophysi.ru/strik?utm_term=midland+gxt1000vp4+5+watts+walkie+talkie PDF link annotation
    • https://welaxulisura.weebly.com/uploads/1/3/4/0/134042468/7861703.pdfIn PDF document text
    • https://wekegakusujesal.weebly.com/uploads/1/3/4/2/134266445/246bb.pdfIn PDF document text
    • https://ritosameb.weebly.com/uploads/1/3/4/2/134266106/3e42ed.pdfIn PDF document text
    • https://cdn.sqhk.co/bidekidarub/gevjfFF/dabasemepadalu.pdfIn PDF document text
    • https://vifapuxup.weebly.com/uploads/1/3/4/0/134018045/juzopidisebokijup.pdfIn PDF document text
    • https://cdn.sqhk.co/wikaraxixi/eKjjjf4/40818024518.pdfIn PDF document text
    • http://navevukosuso.mypressonline.com/24166019447.pdfIn PDF document text
    • http://manibupefif.mypressonline.com/management_of_heart_failure_with_preserved_ejection_fraction.pdfIn PDF document text
    • https://fedofiri.weebly.com/uploads/1/3/2/6/132681193/sadunovigi_zajaxelenizorok.pdfIn PDF document text
    • http://natosabi.mygamesonline.org/76808246141.pdfIn PDF document text
    • http://dofujifeluradep.medianewsonline.com/80447962951.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/jigjeha/clash_of_clans_base_th10_trophy.pdfIn PDF document text
    • http://fufirewavit.getenjoyment.net/astm_e8_tensile.pdfIn PDF document text
    • http://ripugusulufiluj.getenjoyment.net/78895692055.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/f29fe966-4dc4-4651-8523-7b950aa1b8e2/what_is_a_personal_essay_for_college.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51a3b5de-8660-4f53-92b3-efa355e169ae/dowukevovaravejeleker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7d25d90-c325-430a-9921-1c50ca42f9e8/aprender_ingles_con_canciones_para_nios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ca2bc29-5706-4ea6-b793-964ae2ffc765/harry_potter_game_2021_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05b10cdb-dd84-4c31-9301-785a2c6d118b/how_to_turn_on_oil_heater_in_house.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9211449e-075f-40c5-98b6-8ee2fb3a59a2/39635571302.pdfIn PDF document text
    • http://sovogezo.atwebpages.com/17727405993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ca2e4ee-82d1-4821-ab7b-942bb0d72f47/53460239705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24fd7c7e-f76a-4782-bb90-726497b2d73b/1983330345.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/126418ff-f680-48cf-9951-0012c5651ddd/phonemic_awareness_worksheets_for_2nd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ed55e1f-70e7-421c-a2df-4386a886ec07/optiplex_755_compatible_graphics_card.pdfIn PDF document text
    • http://pesetunal.onlinewebshop.net/how_to_fix_a_baby_chickens_broken_leg.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_off0000f8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E9 5728 bytes
SHA-256: c56b23daf6ee45af3996ec2a1215f6c9a2aea3291e076155002c7f8ec57ea9b1
font_01_sfnt_off00010cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAE 11184 bytes
SHA-256: 966df73ff5921168e5ac111f81c02e46eb5970f7d6730de2b95c932f322550ac