Malicious PDF — malware analysis report

Static analysis result for SHA-256 65611e6b6093095a…

MALICIOUS

PDF

84.2 KB Created: 2021-04-03 19:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 27ac187f5a3da4a0b37846d82e31aca4 SHA-1: c3fcb2465decbd80599ee2f5ff224e405df779f3 SHA-256: 65611e6b6093095a539c167d877fa26b2dd2b32bf3831f699c97e1061e323ced
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and redirectors, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The document body, though heavily obfuscated, contains text related to 'ringtones for samsung j7 free', suggesting a lure to trick users into clicking malicious links. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely used as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dafemum.ru/123?utm_term=ringtones+for+samsung+j7+free In PDF document text
    • http://jalazekesofijot.medianewsonline.com/wifuwovafaru.pdfIn PDF document text
    • http://albl.ru/the_art_of_racing_in_the_rain_book_cast_membersdk224.pdfIn PDF document text
    • http://perfectiona.online/79205509320ifvrd.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/how_to_reset_cobra_car_alarm.pdfIn PDF document text
    • http://lefuvaguvupawax.iblogger.org/free_white_background_images.pdfIn PDF document text
    • http://gagefiwirimat.medianewsonline.com/adjective_worksheets_with_answers.pdfIn PDF document text
    • http://tefuvawilutir.mypressonline.com/97953904054.pdfIn PDF document text
    • http://rivugijunamusi.mygamesonline.org/palod.pdfIn PDF document text
    • http://lynciguest.com/13928727793tvjzo.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/db5b79d5-30ef-4098-a239-308ac1901336/what_is_the_difference_between_dawn_and_dusk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89111e19-0c61-4f98-be74-5e92921d4536/renew_oklahoma_drivers_license_online_military.pdfIn PDF document text
    • http://divojeniro.epizy.com/sheet_metal_cutter_machine_harbor_freight.pdfIn PDF document text
    • http://jedirolin.rf.gd/42421219751.pdfIn PDF document text
    • http://niforubuduxema.epizy.com/curriculum_content_definition.pdfIn PDF document text
    • http://bopuxenuxesozu.rf.gd/hpi_savage_25_engine_mount.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36fdd5d8-bdd7-4152-ab76-c2ec9acf67a6/how_to_clean_hp_photosmart_6510_printhead.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fdec67e-99b9-4ee3-9316-02914dc0c11b/wexogotolosudotew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b24d7e9-e584-49cc-9863-3fde254a0e59/penufetowoliterezuzuvadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb15ec4a-e67c-485f-80f1-cacc661006b0/gaxazaninim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f14a09b-8f40-4515-9f67-c3d2ba530c07/bonodikifaju.pdfIn PDF document text
    • http://didabatok.epizy.com/wanenumijotorokiselenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7b0e82b-48dd-432b-b149-08dd76df4999/exide_battery_charger_31013_manual.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_off0000f48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48D 5220 bytes
SHA-256: c13d481c9610f107fccf7f06049721dcbfad7d09c300e0743badd37ef3323d72
font_01_sfnt_off00010653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10653 11656 bytes
SHA-256: 92fbb2a88d75a0971bc34da79f31143ba52cf90b64fa6729cbfa640c940437d1
font_02_sfnt_off00012e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1B 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8