Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f868646f7a7cfb…

MALICIOUS

PDF

102.8 KB Created: 2021-03-29 01:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c5d4d9d0ed44cb5e98345b6e2f70002f SHA-1: 812890c5a79166ebc25f022efc88ba79a67ad415 SHA-256: e0f868646f7a7cfb6c134c198fc1d38bfa9c856278864ced57ead87be422dd6d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake-CAPTCHA lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://jacksth.ru/wix?keyword=skam+sub+ita+twitter PDF link annotation
    • https://feposejixadolo.weebly.com/uploads/1/3/4/7/134744373/eb98c0.pdfIn PDF document text
    • http://rabifew.iblogger.org/medical_terminology_for_health_professions_7th_edition_free.pdfIn PDF document text
    • http://lamomusexosefe.66ghz.com/caries_dental_en_ingles.pdfIn PDF document text
    • http://rinuzaje.iblogger.org/metronidazol_suspensao_bula.pdfIn PDF document text
    • https://fafefojesuvun.weebly.com/uploads/1/3/4/6/134651362/3485766.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377905/normal_5ff1b8acf2bf8.pdfIn PDF document text
    • https://votorivoxezi.weebly.com/uploads/1/3/4/0/134095847/71a006f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443372/normal_60188d4ace167.pdfIn PDF document text
    • https://kamubopo.weebly.com/uploads/1/3/4/6/134631829/viwofexox.pdfIn PDF document text
    • https://mobiduretul.weebly.com/uploads/1/3/4/6/134681609/varojer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450042/normal_604adb9f8c8f3.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/91e680cb-a728-4ca4-9d52-6ea06e6579d1/here_i_am_lord_songs_of_praise.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/corsair_k95_rgb_platinum_best_profiles.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/backup_iphone_android_whatsapp.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/bivakofoketexotoxid.pdfIn PDF document text
    • http://regufowes.epizy.com/baan_thai_menu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05bb0825-56a3-4512-922a-0f19b0300434/24923917654.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1eeea12-c386-4cb1-a37e-6ee2c04fa1d6/rifajememebivogubusip.pdfIn PDF document text
    • http://vogonadebemumox.epizy.com/rccg_sunday_school_teachers_manual_10th_january_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d303de0-2b6b-46ed-b412-c12e9f53b8aa/how_to_draw_cross_section_of_leaf.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/noida_metro_admit_card_2019.pdfIn PDF document text
    • http://zodejewab.epizy.com/40465756801.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/best_android_smart_tv_malaysia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9bb524c-8d28-436d-812c-42845f23fc5a/are_disney_store_employees_cast_members.pdfIn PDF document text
    • http://dikiboxexoginag.epizy.com/how_to_inflate_a_hill_rom_bed.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_off00013ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE8 5196 bytes
SHA-256: 89b9315db8fba0db385b39d3a0b40afd77ed22c4a8966dd619db185ce7746d98
font_01_sfnt_off00014c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C92 13732 bytes
SHA-256: aaf0e688bf336783bb73233002b521bcf908f916e194f6d4173d15c0c55b7fc6
font_02_sfnt_off00017830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17830 16080 bytes
SHA-256: 3cf43d2aa1bc7bf8d16c1c4fdd0fb734b19c39cb762c2b7dd4c7bad761e3df76