Malicious PDF — malware analysis report

Static analysis result for SHA-256 912653a509cee789…

MALICIOUS

PDF

103.1 KB Created: 2021-03-15 11:33:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 39fe4a36d982c4a62b46c197f207c994 SHA-1: cebf67ae58a8565efb8d4eb1ae48dc9010906c93 SHA-256: 912653a509cee78917868817e1ecb9728542ceb19a6a8756123006f3e8ac6b65
216 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a PDF link farm and an SEO redirector suggests a phishing or scam operation designed to trick users into downloading further malicious content. The embedded URLs, particularly the one pointing to 'jacksth.ru', are likely part of this lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jacksth.ru/123?utm_term=busy+works+beats+music+theory+free PDF link annotation
    • http://funasowuto.getenjoyment.net/28969376235.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/juwofelefumulixum.pdfIn PDF document text
    • http://pejelurim.getenjoyment.net/65288693626.pdfIn PDF document text
    • http://xeratigike.medianewsonline.com/balancing_chemical_equations_worksheet_answers.pdfIn PDF document text
    • http://femetorisufi.sportsontheweb.net/62434510362.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://27475d5a-2981-497d-8cd5-0c310ef10f8b.filesusr.com/ugd/9cb927_62f246f0bc7945c8b2a3d3accec6073e.pdf?index=trueIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_b1d456514d954d32a75d4bc1622d15a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a12a6602-bf0b-4939-bedb-8dbf847b7f2c/90704820643.pdfIn PDF document text
    • https://f50ece36-1901-4a7b-9396-968a400df7f4.filesusr.com/ugd/3ecb95_51cce284f7c14f5b89ba878acf143f16.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/54022836248.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/dumigomapunudoxita.pdfIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_9ff2c75da3c047a5a29abec27f869603.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/jenafilut.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/checkpoint_datasheet_5900.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/sasitefudutedezigosixebe.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/craftsman_10_laser_trac_radial_arm_saw_manual.pdfIn PDF document text
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_845da7d5903a43849bf040cf71394a9e.pdf?index=trueIn PDF document text
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_8b94a6751542452992a3649243119b6c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c159a9cd-6cd0-49e4-9707-5fdfc68b0734/sex_and_the_city_season_2_finale.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/13255054066.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4264d918-961e-4d3c-8ed0-05db1fda1362/model_3_price_cut_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/you_ll_be_back_piano_sheet_music.pdfIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_0633a5ddedef4ee7946f82f1e134bd5e.pdf?index=trueIn PDF document text
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_94813188b3e848e5a002442d7e5977c9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0eac928-5e9a-4680-959e-6c955943fc31/08_dodge_avenger_tire_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39a1a30a-7474-4925-b1fa-4173584b08cb/gajigix.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/does_dollar_general_pay_holiday_pay_for_new_years_day.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_off00014661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14661 5312 bytes
SHA-256: e13f881d9ee5b0cbe2353310dfb123f5e888d7eaacf49ad3dfccbd2ac23f7b8f
font_01_sfnt_off0001588f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1588F 11168 bytes
SHA-256: 80598c5c0b7ca62572f2f8c6e0c0dfcce67f23311814cb5698e9f3d79a65538f
font_02_sfnt_off00017eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EAC 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34