Malicious PDF — malware analysis report

Static analysis result for SHA-256 168af39bb99e8e34…

MALICIOUS

PDF

80.5 KB Created: 2021-03-08 16:12:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 499d59a69b9a4856922b7664633cacf2 SHA-1: 9e7596389405ce356e91782b7fed863bb1982ebd SHA-256: 168af39bb99e8e34e14687e6e66ace91d869219c3cfee4250ded97fbb013b059
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting services, indicative of a link farm designed to distribute malicious content or engage in SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and redirect to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://leonvi.ru/award?keyword=adverb+of+time+worksheets+pdf PDF link annotation
    • http://laribij.scienceontheweb.net/wd_250gb_my_passport_wireless_ssd_review.pdfIn PDF document text
    • https://bopugokux.weebly.com/uploads/1/3/4/9/134901566/fafufuvezofusal.pdfIn PDF document text
    • http://ronifibofizet.medianewsonline.com/how_to_renew_my_illinois_drivers_license_during_covid_19.pdfIn PDF document text
    • http://wojesukuzak.mygamesonline.org/is_there_a_riding_trainer_in_undercity.pdfIn PDF document text
    • http://tijukilebag.getenjoyment.net/dnd_5e_avernus.pdfIn PDF document text
    • https://xutonipojoneri.weebly.com/uploads/1/3/4/6/134667901/2746739.pdfIn PDF document text
    • https://zeduxuvanoripi.weebly.com/uploads/1/3/0/7/130775880/9290198.pdfIn PDF document text
    • http://fikosarodone.medianewsonline.com/21586866346.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/46b4e1cf-4bd9-47a8-bf7d-92a86f5dfde2/69754156445.pdfIn PDF document text
    • https://058da8ce-bb30-4b8c-81eb-8903018cac65.filesusr.com/ugd/ab745b_98e480cc16124be5b0ad221d10c38704.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4332a70-50c9-416c-ad3e-97e4a2d498b6/97155072183.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a81d935a-592d-44e1-87da-19a95849ac2c/34668927668.pdfIn PDF document text
    • http://mugomodag.atwebpages.com/terikunonexe.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/the_rosie_project_book_club_summary.pdfIn PDF document text
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_200edd02eb91445781d6378e3a4a3804.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2ad4487-f01a-45e6-ad1d-56cfa455a79a/gasorovoforujijatigili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81df6f84-84fb-448d-a7fa-6ab07f04c705/nulazefabap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bd7ce46-df1f-46a8-a8b4-cd9cec192b03/molecular_cell_biology_impact_factor_2018.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_off0001000b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000B 5384 bytes
SHA-256: e190c704f5f06851c9aef4640c90ac0cfa0cde0beb2a95441e1db3d301c6c2d5
font_01_sfnt_off0001124a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124A 10240 bytes
SHA-256: 6db65074e912c838d785e7846e2493555c7a4722da5590f0d3d51054339b0e3a