Malicious PDF — malware analysis report

Static analysis result for SHA-256 68aa0b39889114f7…

MALICIOUS

PDF

70.2 KB Created: 2021-06-09 03:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: cda8eb6525936b9646d2c1aac39deff6 SHA-1: cf5e1e726da454d687b2d13e58b1e5efc8811429 SHA-256: 68aa0b39889114f7574fb9ec57fa83703a7ea4c2d4940decab82bd7e99b6beef
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many pointing to disposable hosting, and the document body suggests a lure related to 'writing answer sheet task 2'. While no scripts were explicitly extracted, the PDF structure and link farm behavior indicate an attempt to redirect users to potentially malicious content or generate ad revenue.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://garglob.ru/pbw?utm_term=writing+answer+sheet+task+2 PDF link annotation
    • https://redejopodudere.weebly.com/uploads/1/3/3/9/133999864/xepamagovorilumapi.pdfIn PDF document text
    • https://kutusavirub.weebly.com/uploads/1/3/4/2/134265758/benepubapemu.pdfIn PDF document text
    • https://rakafofolobe.weebly.com/uploads/1/3/4/6/134649319/vigizuwugibus-metalagut-fabowivu.pdfIn PDF document text
    • https://vidujari.weebly.com/uploads/1/3/4/8/134858315/nefexodakajuru.pdfIn PDF document text
    • https://gavofazipog.weebly.com/uploads/1/3/3/9/133999173/2088968.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nukuxim.pbworks.com/f/milotobonapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/274754a9-abb3-42da-acd1-62884e6f208f/how_cold_is_washington_dc_in_december.pdfIn PDF document text
    • http://muxopal.pbworks.com/w/file/fetch/144444999/create_a_1040_schedule_c_form.pdfIn PDF document text
    • http://pevozowo.pbworks.com/w/file/fetch/144424260/34855601878.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4547c78-84db-46bb-8b7c-39161deae32f/what_are_the_theories_of_educational_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1de24965-dc23-4720-a778-25ee151413cb/magna_carta_holy_grail_reddit.pdfIn PDF document text
    • http://pudamalulera.pbworks.com/f/types_of_forces_physics_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/192aef11-8bbb-470f-abbc-5c658951f570/when_backing_out_of_an_angled_parking_space.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62fd84ae-3bbf-4156-8b18-c9b2d709a591/diwaxanetajeliperames.pdfIn PDF document text
    • http://zuwofig.pbworks.com/f/20341955716.pdfIn PDF document text
    • http://nimogomaw.pbworks.com/f/9009940679.pdfIn PDF document text
    • http://furalagaposu.pbworks.com/w/file/fetch/144679707/how_to_program_rca_universal_remote_control_with_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a167a792-d539-4c11-8048-17ea75ca4084/96851343853.pdfIn PDF document text
    • http://lopofemusun.pbworks.com/w/file/fetch/144617742/18920005929.pdfIn PDF document text
    • http://saladolu.pbworks.com/f/jenabuwukisorugopasi.pdfIn PDF document text
    • http://wipadewor.pbworks.com/f/eagle_claw_kung_fu_near_me.pdfIn PDF document text
    • http://zotugon.pbworks.com/f/88652294692.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ba7fc02-d70d-4efd-ae99-2dbe4daeedb1/sony_icf_cs15ip_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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD689 5216 bytes
SHA-256: 481b15d1fb3e5a5a2da5c0747d54897a9ecb7621c309ddeaec687950d941ea80
font_01_sfnt_off0000e85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85C 10372 bytes
SHA-256: 50750d6e933036acac2832b4f66ee78dbda4dfbd0fb1245886f396403d38eef7