Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6c85b207f009f2…

MALICIOUS

PDF

70.5 KB Created: 2021-04-08 01:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0382761f591e6566e4634bb244aa999e SHA-1: 7d495493ab0d42cc6d8f6379998b63896f5cc8bd SHA-256: 4c6c85b207f009f2b4988641cc611c24770c567baf0d61ef7375b9586efff08f
184 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains text that appears to be a lure for users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/wix?keyword=i+keep+it+taco+jhin+guide+season+10 In PDF document text
    • http://esportzmlevent.com/educational_psychologist_jobs_scotland2dlbm.pdfIn PDF document text
    • http://max-lifting.store/how_many_carbs_in_a_krispy_kreme_cream_filled_doughnutbm348.pdfIn PDF document text
    • http://kleomaften.online/modern_indian_history_podcastqyy7k.pdfIn PDF document text
    • http://spindlndou.space/xbox_one_wireless_controller_adapter_for_windows_7xnnm3.pdfIn PDF document text
    • http://8bitbeardsco.com/how_to_convert_audio_to_midi_in_abletonq3hl7.pdfIn PDF document text
    • http://copyrighthelpbusiness.net/blackdecker_st9000_6.5_amp_14_inch_electric_string_trimmerjtuky.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_df8b50dbde014082bd581a34fec16bc0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazemi/7234326143.pdfIn PDF document text
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_febb4d6585074abcbf2aaedf2b3657d0.pdf?index=trueIn PDF document text
    • http://degefoxovovi.epizy.com/bihar_masti_ing_pramod_premi_ke_gana.pdfIn PDF document text
    • http://tikolikenugim.epizy.com/detifimixevupajisoxano.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/sasomekaponupovemadodavi.pdfIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_24f576e2519e4f51a2c2a10a1de20e2d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aee3465-7fa2-403c-a060-23c30dd3032f/piditigejelezabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/779b47f8-78f7-4ce6-8755-bf32e4f5d2fc/ibn_kathir_quran_tafseer_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b3203fe-6a92-4511-b567-7cc116cf2b1f/how_to_make_an_adjustable_knot_for_string_bracelets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/166ff58a-51fb-4cb5-8eaa-d8dd18947c49/pufekuvujakap.pdfIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_0dc0154bb8b34544a72765877e806e8c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/somamere/17550447698.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/mefavofaxatofopisekox.pdfIn PDF document text
    • https://369206df-e466-4f8f-9771-850d1edb33c5.filesusr.com/ugd/8fd5dc_faaa69ae2aa8446782a0627ebd4593d4.pdf?index=trueIn PDF document text
    • http://rujetekanag.epizy.com/application_of_computer_in_agriculture.pdfIn PDF document text
    • http://lurorozowuwa.rf.gd/wujawigoxibefug.pdfIn PDF document text
    • http://roniwixanedif.epizy.com/cisco_packet_tracer_7._2_netacad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7ecc299-2f99-4e60-8ffd-faa12ebf11f0/51950559953.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_off0000d581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD581 5476 bytes
SHA-256: d9ec213ba1a4d216811acef1f89842ff9b67c1e246f0ca7296fd7481dd5b66a4
font_01_sfnt_off0000e82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82D 10832 bytes
SHA-256: 471060e01959fdf00735bad92f59105f18f6c33a9057669ce688d1d494543927