Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1fa90ef1c1a3c42…

MALICIOUS

PDF

73.1 KB Created: 2021-03-09 01:04:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 15a289691618cb969fb22df7cf9f5578 SHA-1: 613a258071ee7bf68d031240a2131ffe4979d861 SHA-256: d1fa90ef1c1a3c4273029daa462c8c03923f928dcf3c0454d53f82c498d92607
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users. The primary external URL, https://jacksth.ru/strik?utm_term=jbl+flip+3+stealth+edition+price+in+india, appears to be part of this scheme. ClamAV and ML classifiers also indicate maliciousness, consistent with a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/strik?utm_term=jbl+flip+3+stealth+edition+price+in+india PDF link annotation
    • https://mufajagirudul.weebly.com/uploads/1/3/1/4/131452858/dujofifizuxaruz_kotogaw_wadajepifata_debopalejupok.pdfIn PDF document text
    • https://seritixatot.weebly.com/uploads/1/3/1/0/131070849/58341a2708c55.pdfIn PDF document text
    • https://kixipebirivevex.weebly.com/uploads/1/3/0/7/130739750/naripuvanab.pdfIn PDF document text
    • http://remont-pc.website/hicksville_schools_report_cardb7u6u.pdfIn PDF document text
    • http://limuzinof.ru/amazon_sex_and_the_city_all_seasonsxjz4c.pdfIn PDF document text
    • http://esclick.pro/what_was_the_pax_romana_and_why_was_it_importantr6ckm.pdfIn PDF document text
    • https://giretalude.weebly.com/uploads/1/3/4/6/134677333/9631127.pdfIn PDF document text
    • http://wordwild-store.com/brightness_level_appj1nmn.pdfIn PDF document text
    • https://digikugububim.weebly.com/uploads/1/3/0/7/130774990/titajazame_gezenirex_wujasavotiwudan_fepemu.pdfIn PDF document text
    • http://white-x.fun/ligixazujetojorondcbuu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_b9bad00f2048495eacdd84a1fe396781.pdf?index=trueIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_e66ae48552904b5f853b9fdee1f69be8.pdf?index=trueIn PDF document text
    • https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_9336e3ce23b94642b812d29c32211ab5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac5f1172-eee5-4a4d-b660-fb4b9b420392/76775444099.pdfIn PDF document text
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_f261d147e5e244e3b389d77aef411ffc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6001039-493d-40d6-9c68-cecf6c88d2e5/what_to_do_if_your_wireless_keyboard_doesnt_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce5f8dde-a06d-461a-95f5-2fc1be0f835c/bible_study_for_newly_married_couples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec32c95d-2cb2-4b97-9c6b-12a7f16de910/project_management_certification_uk_pmi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/905f821e-1f38-4c1e-932a-3bdcdb1df8d1/zerejazogiwoxozalamafurus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92ec0f74-a2db-48e5-8075-64f2f9984d42/4185629566.pdfIn PDF document text
    • https://67bb8873-ca08-4da4-87c0-60a8072ebff6.filesusr.com/ugd/a838c0_009cc5d293c84e7991aeaadee1267eff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/575679b1-3ed7-449d-a2f4-fe42c2cf7720/43185495054.pdfIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_ff801fe41f514aa288e49fc80664669a.pdf?index=trueIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_54e926aa494d4127ac38e1c2a7919669.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_off0000e0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BB 5536 bytes
SHA-256: f6930181fc054d7b43a2e8ed43c2f238ab1b058db0c39c69702ac80fdff73050
font_01_sfnt_off0000f37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37B 10372 bytes
SHA-256: 2fc8266b2f222ef75f5e207ff8f6ea10c69648768a7225f8c3ad8eac7b79df23