Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1162addbb6822e…

MALICIOUS

PDF

87.4 KB Created: 2021-04-21 10:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 762ba348132140f84596fabc1794f39d SHA-1: 83dfb39dcf7538522e3e08ea7c2b630ed9f2ea62 SHA-256: 8a1162addbb6822ee4b8d147442a292d4e115cf18e872441dc112c5b0caf744e
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful sites. The ML classifier and ClamAV also strongly indicated maliciousness.

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 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.
  • 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=how+to+do+edpuzzle+again In PDF document text
    • http://rorixuge.iblogger.org/pumosidonigoxokoxozil.pdfIn PDF document text
    • https://zumaraje.weebly.com/uploads/1/3/0/7/130776401/564bc29a1.pdfIn PDF document text
    • https://kenibuxe.weebly.com/uploads/1/3/4/6/134688639/2e8de1e3b5e1306.pdfIn PDF document text
    • http://kamijuzexujap.iblogger.org/56572927816.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoreli/jbicnTu/xtreme_laughlin_jet_ski_rentals.pdfIn PDF document text
    • https://cdn.sqhk.co/pidikuso/ighagcY/tap_tap_pubg_pc_download.pdfIn PDF document text
    • https://lonawapusar.weebly.com/uploads/1/3/0/7/130776864/b9d697aa3d.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/6d819fe2-4ffe-4a12-b85c-c95975061111/worovamonexuxirutarixoge.pdfIn PDF document text
    • http://pokitudid.epizy.com/92355884235.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5d1c270-792c-47fa-9eaf-ee87ef7cd683/weird_st_names_for_confirmation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fe72a77-cba5-4de8-9d22-0746a7477d2e/how_to_set_up_hotspot_on_iphone_4s.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba0b63b8-4041-4f8a-bdc2-d55788800351/hp_laserjet_pro_400_color_mfp_m475dw_software.pdfIn PDF document text
    • http://panamawusuk.epizy.com/bitmap_books_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b2e24f8-5233-43e2-9509-d0c988dcba03/3188048711.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7361b02b-ff6e-45a4-83dd-995284a040cb/75107133660.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c8e953b-032e-4883-8999-f9ad605c2c21/what_is_the_characteristics_of_an_argumentative_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de48dd91-5197-4d6b-8ac8-c53205cbb686/difference_between_the_fault_in_our_stars_book_and_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd72cea2-ed61-490b-9c72-722e7f720755/gepufuvabowuz.pdfIn PDF document text
    • http://jurolabadujo.rf.gd/multiplayer_car_racing_games_mod_apk.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B1 4956 bytes
SHA-256: 775d09ea23641a452e069b00840f1d93948dbbf687708ef9e85dca5142e83c0f
font_01_sfnt_off000114be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BE 11408 bytes
SHA-256: 4756a7abb1d3022e26e7c23fd5e763c7bc290003632ff42e0f87ebae3e2f6c6d
font_02_sfnt_off00013ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA9 16080 bytes
SHA-256: b118ad4a5f0f66e944d0a6e82a0dad6050c27e77cb1eabf64d07f40874ae21b7