Malicious PDF — malware analysis report

Static analysis result for SHA-256 8677bc3202e2c0c4…

MALICIOUS

PDF

76.7 KB Created: 2021-05-05 13:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d90df30646de2926d727c2c846dcbe28 SHA-1: c04ce4107804e4ef0e278cb35fb01c955390fb66 SHA-256: 8677bc3202e2c0c43314ed9d18c0e5bbeec2269412bd062c8ae2a3eaa6970ae0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were extracted, the PDF structure and URL patterns are consistent with a phishing lure attempting to exploit user curiosity for common technical queries.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://resalured.ru/strik?utm_term=how+to+factory+reset+my+samsung+blu+ray+player PDF link annotation
    • http://vquest.website/wabaponinetibumjnhuw.pdfIn PDF document text
    • http://pelabinowoguk.getenjoyment.net/belajar_bahasa_arab_dasar_sehari_hari.pdfIn PDF document text
    • http://katalog-siberian-force.online/71644967333v4tsx.pdfIn PDF document text
    • http://fb-ig-copyright.com/does_dennys_give_you_free_food_on_your_birthday58rub.pdfIn PDF document text
    • http://sexedate69.site/jubadoky3n0.pdfIn PDF document text
    • http://samelike.site/sojezuxawobofasidqyne.pdfIn PDF document text
    • http://ozalupa.space/death_cure_castj0gxh.pdfIn PDF document text
    • http://alphabitx.com/sign_up_for_chick_fil_a_app58q5t.pdfIn PDF document text
    • http://healthytrands.com/11372789200oco5l.pdfIn PDF document text
    • http://ig-soft-team.com/how_to_watch_after_we_collided_right_now4vqxy.pdfIn PDF document text
    • http://hookup668.site/limoguroxipumagoxhkjj9.pdfIn PDF document text
    • http://mukinokelek.mygamesonline.org/bedijovuwu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/class_11_physics_formula_sheet.pdfIn PDF document text
    • http://jagazasa.epizy.com/microsoft_excel_2020_cheat_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/192e0f3c-e36a-487c-8b62-4701a8c88db1/how_to_connect_hp_officejet_2620_to_computer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b69f8dd-bffe-4150-891f-f795a5fb3a31/how_to_fix_a_charger_that_wont_charge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/714087c9-3448-498c-87a5-ff4120ddd552/bike_running_lean_or_rich.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7282f080-a251-4f1e-9cb5-54742d06edd6/72678906560.pdfIn PDF document text
    • http://tekubone.epizy.com/tratamiento_de_anemia_ferropenica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f0b4a96-3905-4fd2-b862-f5552d7fe46c/how_to_become_a_certified_cdl_driver_instructor_in_texas.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_off0000ee21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE21 5632 bytes
SHA-256: 934f64e5806a0a3863a2657fa3ba918e4f20bfc516249729764eab3e43dab505
font_01_sfnt_off00010152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10152 10520 bytes
SHA-256: b9edb3a5cc5ef6d6f361dd4b77ef0ba1fadd0afc0464170df35155c89af65864

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