Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eb1b9e9d9a74c3e…

MALICIOUS

PDF

133.2 KB Created: 2021-03-16 03:49:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: acd5e12fdabae0f41a42d90dc4db182f SHA-1: a21ad47b82b268298ebaca9c57a55a89146bc12c SHA-256: 1eb1b9e9d9a74c3ed234aa4f28015ac2efaa3af4aef664eab21ca1d1cd9307e8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/123?utm_term=ny+subway+map+pdf PDF link annotation
    • https://cdn.sqhk.co/dijabidasu/ja1ghvD/crewmate_hunt_checklist_app_for_among_us_game.pdfIn PDF document text
    • https://cdn.sqhk.co/libudezetuv/GghTgcn/tirefixuwe.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/fZagghe/little_oxford_thesaurus.pdfIn PDF document text
    • https://cdn.sqhk.co/wolonevavaru/pfxgfLZ/nba_2k20_ps4_pro_review.pdfIn PDF document text
    • https://cdn.sqhk.co/zekuxemelop/1eVCU3d/color_changing_wallpaper_for_walls.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469128/normal_60098f5d15a1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449766/normal_6016c5c50b761.pdfIn PDF document text
    • https://cdn.sqhk.co/lokabawopup/fx5jb89/talking_birds_for_sale_in_houston_tx.pdfIn PDF document text
    • http://ropufogesuzazeg.iblogger.org/15974854807.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/jgwidgi/buvegufomuviso.pdfIn PDF document text
    • https://cdn.sqhk.co/kopizikob/hbW5kIK/94852353022.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/349ca207-6a46-4c5a-a478-cc85470c95c4/69845597071.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/49413686499.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/774adaba-a6e2-4ad0-a4f2-6eafdae511ff/69507897162.pdfIn PDF document text
    • https://s3.amazonaws.com/sudevejerifu/kezawixiwu.pdfIn PDF document text
    • http://fuvogel.rf.gd/40880003967.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/ramadan_calendar_2018_bangladesh.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/anomalistic_psychology.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/97154423360.pdfIn PDF document text
    • http://fufabufitilaf.epizy.com/webanixup.pdfIn PDF document text
    • http://puwagof.rf.gd/english_book_class_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a81645d6-6bcb-4b28-bf61-3475f8eafb49/what_does_due_diligence_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f3c54bb-99ab-4426-b716-3a6dbc089329/perimeter_of_rectangle_worksheets_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001be6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE6B 4780 bytes
SHA-256: a8c08eefd39f7dc02ad1d15a15e49cc3c46155b7c6220ab2924642a33ab78ac3
font_01_sfnt_off0001ceb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CEB2 12240 bytes
SHA-256: 0ee37221e386efd862c5b24d37f7446aee2b9c8560b73fb2a659ac3bddb55630
font_02_sfnt_off0001f84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F84B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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