Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa682ebfd19988e8…

MALICIOUS

PDF

74.9 KB Created: 2021-04-03 17:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d6b6f7abb602e5c401bd89588adeac7c SHA-1: ca2a251cee722977d9c44dd8ad9dd487af62d1c3 SHA-256: aa682ebfd19988e8b5addece70b6b2968d1a0c00fcfdfa49d41b659b5b619be3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by a ClamAV signature and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting it functions as a link farm. The primary malicious URL identified is https://midufefew.ru/strik?utm_term=grade+three+language+arts+worksheets, which is likely used for phishing or to distribute further malware. No scripts were extracted, but the PDF structure and link farm heuristic indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://midufefew.ru/strik?utm_term=grade+three+language+arts+worksheets PDF link annotation
    • https://nematoluzi.weebly.com/uploads/1/3/1/4/131409841/6030721.pdfIn PDF document text
    • http://instgramcopyrightdispute.com/free_graphic_design_software_for_chromebooklgwm9.pdfIn PDF document text
    • http://vinnipoh.space/creature_of_frankenstein_quest_guide_osrsr30ya.pdfIn PDF document text
    • https://lolidinol.weebly.com/uploads/1/3/4/8/134884516/5fcb80c6a8e.pdfIn PDF document text
    • https://xagomutub.weebly.com/uploads/1/3/4/3/134321984/titebireneloki.pdfIn PDF document text
    • http://richteam.site/neperegoko45d.pdfIn PDF document text
    • http://ses-paypal.com/john_cena_phone_number9t88j.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/302a7408-1c08-448e-a2e7-b1f899af0f83/64827147004.pdfIn PDF document text
    • https://df867d32-629d-4b48-af14-2fc5df20f827.filesusr.com/ugd/287761_4227b718bdd841ffb1d96b416eac27fc.pdf?index=trueIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_2a9003b4f1654b4392f6bd69eb01a722.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/15a625dd-25f8-49a8-bafd-e7a7490d087e/bose_companion_2_vs_20.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b079d3c-7002-4bef-adca-c18d23b1eee7/forowafavunajubawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed74bb1e-5988-41e5-a7d0-0c22b94fcfa0/electrical_installation_practical_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed1ce767-440b-4335-ac98-4b091f8328f1/tyranny_of_the_urgent_define.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7297b6a-4347-4f99-b9c5-14535d5944db/rheem_tankless_water_heaters_reviews.pdfIn PDF document text
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_616604a29d964fe88fa08a2287aee67c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e80a78d3-fc0d-410a-98dd-dea1fb6caee1/69379404587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8963237e-86e1-43f2-8b52-fdbff0bb550f/70481116906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5e43cce-adac-4f02-9c27-b06570708bb3/11125113736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7d18fce-f8d9-4c16-851e-72191a4f1d47/plague_inc_apk_crack_fr.pdfIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_7e055956a4ed4c90a15761b12146fbed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f9563bf-2f08-40e5-95c2-da76f028373c/muwexoxuzepipevodud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22bfb66c-4140-49af-9a36-f0db4859f331/vulotuzimejev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caed2358-4f72-4216-8f46-131c7bd8d0d1/skyworth_tv_65_inch_review.pdfIn PDF document text
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_4ff95789ad3f4391a70c6cf9dff8438b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f13dfc6b-4f6b-4c3c-a299-d2caebe22f4f/xisisufofik.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_off0000e746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE746 5272 bytes
SHA-256: 3364c0b3f747c748d802847af2b3445c0bd480e949e0aa520d43d7384374c310
font_01_sfnt_off0000f941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF941 10732 bytes
SHA-256: eb3feee61d66d883e79568565a5914c663c2ab8adff6ccc6cebf379dad944d27

Open this report in the interactive analyzer, or submit your own file for analysis.