Malicious PDF — malware analysis report

Static analysis result for SHA-256 73071c3bd557e550…

MALICIOUS

PDF

83.0 KB Created: 2021-03-24 11:42:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 632665de8e485a9495072d8dbe102e1b SHA-1: 063d24fdb16ad0c0189468dc576f05a09c426b6e SHA-256: 73071c3bd557e55068cd614bcb657608358a82a09ed96ebb124406aac3394943
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9995

Heuristics 6

  • 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 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.
  • 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://nipisod.ru/wix?keyword=words+for+group PDF link annotation
    • https://cdn.sqhk.co/pumafuki/idMzifk/dragon_ball_z_dokkan_battle_wikia_fr.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/wHNXshc/nofatemokogos.pdfIn PDF document text
    • https://pujowuvorokom.weebly.com/uploads/1/3/5/3/135347933/poxitimizakise.pdfIn PDF document text
    • https://wubudebekezame.weebly.com/uploads/1/3/0/7/130740051/votisuwolawajerulodo.pdfIn PDF document text
    • https://jalusuduzewot.weebly.com/uploads/1/3/1/4/131456012/2630100.pdfIn PDF document text
    • https://cdn.sqhk.co/nemisova/nia0zgf/gesavakorazuwagu.pdfIn PDF document text
    • https://sasozubavurak.weebly.com/uploads/1/3/4/8/134886198/5580938.pdfIn PDF document text
    • https://doxizuzipoleri.weebly.com/uploads/1/3/5/3/135323895/ruwelonapagorefemiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/889008fd-c729-412a-b516-5cd8c5377660/73281636853.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eecaa2ec-96b3-4b0f-a797-c5afa8460689/free_printable_phonics_worksheets_for_1st_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f7624fe-0e5d-42e8-a847-f11b494b0911/chamberlain_liftmaster_professional_formula_1_belt_warranty.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8dd3f75-2ca2-4003-83fe-a2f094e147ba/47110865884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2c644b5-5d05-4ede-aafd-65f7b028265c/sepexiwajowerepis.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/nebudogarizazuli.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/96928196215.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b144cfc6-98d9-497d-a642-bb83be8880c7/julius_caesar_shakespeare_translation_act_1_scene_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e22621fd-9ec5-429c-b5b3-f5a2defd56ab/zekalasesexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/479993c5-19b7-475a-b232-fc9814fb2224/52671223670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90e07e5f-8880-4881-9f78-e3cc10d55420/rijubasizefajusivem.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/full_information_about_skill_india.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/brett_young_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a01bc8b-d0c3-4a66-a62d-a8ab2d28412f/what_is_the_benefit_of_reading_surah_mulk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC75 4508 bytes
SHA-256: 345e5df2fe673a357b6ee5b583b4a4aea3292dfb2e4e6431247a63c196e07ba9
font_01_sfnt_off00010bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDE 10684 bytes
SHA-256: 0520f1481c84f6effd0776c94b2cd2dd38e07e5223acdd182527f5faeb1e911f
font_02_sfnt_off00013042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13042 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230