Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f6eff3e237c09d…

MALICIOUS

PDF

75.8 KB Created: 2021-03-24 03:11:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8554819a68056bec49a34fd273dcbf2f SHA-1: c886898d18774e78efbc68bbe6c6deb33d330af6 SHA-256: 20f6eff3e237c09d48eb222d547a2a267efc0ab238c1c19412759d88601f747c
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 0.9993

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://jottigo.ru/123?utm_term=calendar+2018+with+holidays+template PDF link annotation
    • http://ionatr.space/49716019335mwygz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415052/normal_6045fb8b8140b.pdfIn PDF document text
    • http://excschool.ru/74446142031s30ss.pdfIn PDF document text
    • https://nodazijokavi.weebly.com/uploads/1/3/4/3/134315007/091170975fd.pdfIn PDF document text
    • https://wegekasi.weebly.com/uploads/1/3/4/6/134678838/3007134.pdfIn PDF document text
    • https://radisowe.weebly.com/uploads/1/3/4/3/134366404/8355592.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/calotropis_procera.pdfIn PDF document text
    • https://buginibonimej.weebly.com/uploads/1/3/2/7/132711973/giloxapaga.pdfIn PDF document text
    • http://wiinorama.fun/jack_and_the_beanstalk_tiger_talesicxqt.pdfIn PDF document text
    • http://wetiludivarag.scienceontheweb.net/egg_biryani_recipe.pdfIn PDF document text
    • http://leaninrzpd.site/dojetawawapakubigabixa8j1ac.pdfIn PDF document text
    • https://meripowubizaj.weebly.com/uploads/1/3/5/9/135959363/kimatofalefuvukug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490252/normal_60125f44d609f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jowosos.myartsonline.com/hp_laptop_6470b_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e5ecd88-b3ed-48e7-b192-e78aa939f504/flowchart_maken_word_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b4675bd-49f1-4b6d-a442-5edfa5bbdfd2/honeywell_th5220d1003_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50696013-b660-4096-988a-345e28557fb9/ganamrutha_bodhini_buy_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f5bc5d6-9886-4daa-8c29-1c09e47b744a/john_deere_original_lawn_tractor_deluxe_large_cover_lp93647.pdfIn PDF document text
    • http://xologikaju.atwebpages.com/broadcast_media_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78693098-82b7-4e3e-a6b2-b6d26ac9d8e8/gozarozadapu.pdfIn PDF document text
    • http://kibagog.onlinewebshop.net/deductive_and_inductive_research_methods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b11e4d0e-9927-43f5-ba5d-ff3b79c70c5b/mutabofatopixejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/416acdee-0eeb-4294-952c-c3c21f3c85fa/dell_optiplex_9020_guide.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_off0000ea8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8E 5816 bytes
SHA-256: e7da40859daf442522b0cf281206490beab99f04970d111e69c92c57357a9f13
font_01_sfnt_off0000fe42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE42 10572 bytes
SHA-256: c186dc15ef7e4d2ee6735742990372ddb6cfe39cb42ec8253857cd3328af8882