Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a621c0b18d2e40f…

MALICIOUS

PDF

77.0 KB Created: 2021-04-26 08:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: fd693ff8e0819165be802cd748f04520 SHA-1: 2f75919e6635793ef4b415363a06d9ffb73481fd SHA-256: 1a621c0b18d2e40fca5c80429261c58010ba9d7ee469039aa51b9a6bcaf8ccaa
192 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with critical heuristics identifying it as a malicious redirector and a link farm on disposable hosting. The ML classifier also flagged it with high confidence. While no scripts were extracted, the presence of numerous links to potentially malicious domains suggests an attempt to lure users to phishing or malware sites, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dafemum.ru/strik?utm_term=mustang+owners+club+uk+cars+for+sale In PDF document text
    • http://yandex-dostav.ru/pavemagilezunubeliwidutis0w61.pdfIn PDF document text
    • http://betomererag.iblogger.org/pobepodip.pdfIn PDF document text
    • http://about-igsupport.com/what_is_the_life_expectancy_with_alsjrcph.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/norcold_refrigerator_quit_working.pdfIn PDF document text
    • http://igme.site/the_god_of_small_things_summary_in_hindiqacez.pdfIn PDF document text
    • http://bumaga.bz/getting_to_know_arcgis_pro_2.6_third_editionnp8uq.pdfIn PDF document text
    • http://dewisazovuvoxi.mywebcommunity.org/how_to_pair_remote_control_to_samsung_tv.pdfIn PDF document text
    • http://podjem2.club/best_launcher_for_android_tv_boxke83p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://acbe2b0b-ee64-4eea-b0ce-372b1aa9cc7a.filesusr.com/ugd/4bcc67_f1d6b968d6934430b1ae76588f7c7efe.pdf?index=trueIn PDF document text
    • http://zifokorakimedak.rf.gd/89092430841.pdfIn PDF document text
    • https://a581e706-3bf6-41fb-8978-ad4d4077590d.filesusr.com/ugd/afbe6b_969c7471a119419f9e94fe205a0587fb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a262a711-6105-4b98-96e4-a1b4192d22c8/laboratory_management_principles_and_processes_third_edition_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cc59cde-2572-4ed7-9250-1a335554bc8d/honeywell_th8320u1008_factory_reset.pdfIn PDF document text
    • http://palinimawibiw.rf.gd/viwuninobej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aa54c4a-7764-49db-9888-2b2273f94b16/how_to_service_ge_washing_machine.pdfIn PDF document text
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_1ac3cd408ebb4f16b1a515923208feb3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c865dcaa-7e39-4dbf-89ab-e3d78c3cdcdf/70380470209.pdfIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_0b9e1662966c4430b2e732c2a7dd97d3.pdf?index=trueIn PDF document text
    • http://jisufosesuku.epizy.com/free_download_reader_for_pc.pdfIn PDF document text
    • https://44b3a7a5-560a-4dc8-bf2c-49d9b11486fe.filesusr.com/ugd/fe0276_e67d6ea9b2a948ff9b8ae8272b4f0e3d.pdf?index=trueIn 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_off0000ef10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF10 5352 bytes
SHA-256: 9ad59f48244328df68901ccc58a3e94c6df9f1616fadb0a289a3067011c23f51
font_01_sfnt_off00010177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10177 10988 bytes
SHA-256: 7721690c8bf18df33ff84d913c1f73e252d95e760a417df8a678efe07e99140e