Malicious PDF — malware analysis report

Static analysis result for SHA-256 4debb47ff42360c6…

MALICIOUS

PDF

76.7 KB Created: 2021-04-07 08:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 37f695a0f42502bef576e3f8b4c6e887 SHA-1: c4c5df000e3a1c1eaecc4b54df9a050a37683194 SHA-256: 4debb47ff42360c6ab795196fa890731cd46f8a6816ba21dd02faa336a8f9681
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The embedded URLs and the PDF structure indicate a link farm designed to direct users to potentially harmful sites. While no scripts were explicitly extracted, the PDF's nature and the malicious URLs suggest an attempt to redirect users for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=pride+and+prejudice+and+zombies+movie+or+book In PDF document text
    • http://nikubet.iblogger.org/advantages_of_pneumatic_system.pdfIn PDF document text
    • http://pivowave.iblogger.org/cantos_del_camino_resucito.pdfIn PDF document text
    • http://faguduni.22web.org/balijan_weather_report.pdfIn PDF document text
    • http://legiontry.online/firefox_48_32_bit_portable_downloaditnl4.pdfIn PDF document text
    • http://hookup671.site/57378790851udqzo.pdfIn PDF document text
    • http://presentinsta.online/international_law_firms_melbourne3zp1l.pdfIn PDF document text
    • http://probnik1313.tech/55398504564b9jh0.pdfIn PDF document text
    • http://albl.ru/hot_springs_spa_heater_replacementuzasu.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/5f8be998-3c28-412b-98ab-bdd22017528c/sole_f65_treadmill_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5baad89-9679-4dfa-8d2b-e7ac0a757d44/multiplication_chart_30x30.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93933128-fb0d-42dd-9714-befb8b458b18/zokasupuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1fdf6f9-e3b8-445c-a342-073274926c77/skyrim_load_order_tool.pdfIn PDF document text
    • http://notewewagegev.rf.gd/54991088757.pdfIn PDF document text
    • http://valogaberel.rf.gd/is_navy_federal_open_on_saturday.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d18210fa-92b6-4f7a-b993-d8c216a0ba45/what_do_you_need_to_know_when_buying_a_used_car.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d0a29cf-b639-44ff-b812-1845e5a64809/jaduvututavowewuragimisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3be00642-a455-48fb-b388-192e0424e1fa/dirupubalovosewajoxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21e7e96a-3bff-4bd4-b1f2-0e7a82524f65/79174764303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d787a97f-6eb8-4e16-ad3c-428eddf05cc4/farefojuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db37b0c4-0361-401a-bdb8-2bce069c24f4/art_models_book_free_download.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_off0000ea2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2D 5580 bytes
SHA-256: c877383b81c55362bc5602d33b9e1a1b724aae133bd2e50d92625756a8cb2f17
font_01_sfnt_off0000fd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1F 11464 bytes
SHA-256: 9634c414973f968f91a650984811dbcfe58e36d6a88c3308da6f8d36d85d6035

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