Malicious PDF — malware analysis report

Static analysis result for SHA-256 755990d411fa6dd3…

MALICIOUS

PDF

78.2 KB Created: 2021-02-07 18:43:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2f9b169c242fe70e8804d212d6dfbf83 SHA-1: 2b0502a972b9c5b972f44d1021f3627c727fcc39 SHA-256: 755990d411fa6dd3a7a33653df1d9b13a2f45d3ef1f0d3b87aa045ea2ac107c6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be directing users to a network of linked PDF documents, likely for malicious purposes such as phishing or malware distribution.

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=queerplatonic+partner+definition PDF link annotation
    • http://xtw2.club/viraxotonev1i3rf.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/fGhiShc/12059972030.pdfIn PDF document text
    • http://onlinekartiadesi.com/citizen_eco_drive_skyhawk_manualakba5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447640/normal_5fed92b7b81c9.pdfIn PDF document text
    • http://sberpodarok2020.online/bteup_result_2015_marksheet3h3a8.pdfIn PDF document text
    • https://cdn.sqhk.co/fitamorigob/hiAqUjg/fivanukumagazefesid.pdfIn PDF document text
    • https://bunosepe.weebly.com/uploads/1/3/1/3/131379858/6362740.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/o7gi9gd/earn_to_die_lite_hack_apk_download.pdfIn PDF document text
    • http://comp-arenda.site/hdfc_amc_stock_forecasty16f5.pdfIn PDF document text
    • https://jokazetesolibut.weebly.com/uploads/1/3/5/3/135314514/1516073f.pdfIn PDF document text
    • http://allfreebets.ru/best_notepad_like_app_for_macofjfk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474222/normal_5fdf9e2cf2294.pdfIn PDF document text
    • http://all-gopro.com/morekzss24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420776/normal_5fc6154aed3bd.pdfIn PDF document text
    • https://cdn.sqhk.co/lajoroteb/o51tig9/descargar_extreme_moto_winter.pdfIn PDF document text
    • https://cdn.sqhk.co/rumomezojeku/Zhd2rHN/kutolilijifevu.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/chjehjS/6475731810.pdfIn PDF document text
    • https://cdn.sqhk.co/pivugisaxap/Algglgh/lusadub.pdfIn PDF document text
    • https://cdn.sqhk.co/likunubiba/cEh8qic/new_cartoon_movies_2018.pdfIn PDF document text
    • https://javumegibevi.weebly.com/uploads/1/3/4/6/134634398/3102616.pdfIn PDF document text
    • http://instofficial.online/tinovowajutiseweliwitewejonuwm.pdfIn PDF document text
    • http://bioforcecolumbia.site/isotopes_worksheet_fill_in_the_following_tablebezbb.pdfIn PDF document text
    • https://pupikitonusu.weebly.com/uploads/1/3/5/3/135301263/759011.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF615 5032 bytes
SHA-256: 7f5bcad7b259e4d2f5aa0ebcc0e9d49ab78fccb67d6ab5c7c19f8371447b4e41
font_01_sfnt_off00010743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10743 10648 bytes
SHA-256: c49b813025e221d968bd58def900088c8b260f0d0cc5e744fb4a1a1c488b49d1

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