Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2ced43e89c45da…

MALICIOUS

PDF

75.3 KB Created: 2021-06-05 03:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d8ea4c512566651d5b5a55df907de8de SHA-1: 71a349039bcea9bdb4f64dc86fdce717bdb234d6 SHA-256: 2c2ced43e89c45da64368d8c3d2f6297e0beed86ba2be89ca118793206c08b6f
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 0.9990

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://crewmak.ru/pbw?utm_term=adjectives+and+adverbs+grammar+explanation+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462678/normal_601b3c5f30fbb.pdfIn PDF document text
    • https://tasunukalen.weebly.com/uploads/1/3/4/8/134888382/fipuboza_janilif_jiged.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376854/normal_600dd9a47b555.pdfIn PDF document text
    • https://foravidamekog.weebly.com/uploads/1/3/2/3/132303307/0b4c388f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401711/normal_5ff4b63059161.pdfIn PDF document text
    • https://gaxepofujar.weebly.com/uploads/1/3/5/3/135348048/zumedidos.pdfIn PDF document text
    • https://mebemawadaj.weebly.com/uploads/1/3/5/2/135295691/gusufepit.pdfIn PDF document text
    • https://senuwisaf.weebly.com/uploads/1/3/4/0/134018119/wuvapuw_ziguv_lezamonipifu_ripijokepu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374177/normal_6026cc97b3df3.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/d52c4d9c-6193-430a-8c0f-fe35c6cef278/los_nombres_de_dios_y_su_significado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba932e81-1bb9-4d3f-867f-552ac21b16c9/nakujisamenutuzis.pdfIn PDF document text
    • http://joxupakager.pbworks.com/w/file/fetch/144601035/quality_check_sheet_template_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0da0907-0ff2-461e-aaba-95214d25f865/75704115354.pdfIn PDF document text
    • http://zizovitunex.pbworks.com/f/can_you_play_nba_2k20_offline.pdfIn PDF document text
    • http://gibudufu.pbworks.com/f/sosepobazavixalobo.pdfIn PDF document text
    • http://pinurakus.pbworks.com/f/14299028367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/246c151f-18db-4ece-8f5c-c6ff55186761/voloverijojige.pdfIn PDF document text
    • http://jizakatum.pbworks.com/f/fanumavu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33eafbef-4e8e-4f9a-b2c2-2fc2ec9e9870/conair_1875_watt_cord_keeper_hair_dryer_with_folding_handle_and_retractable_cord.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5b495d2-5378-4b72-9e17-dc5d55802164/which_of_these_is_an_example_of_classical_conditioning.pdfIn PDF document text
    • http://pajinap.pbworks.com/f/71042091568.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63043b98-6ff8-4a83-b435-e9f4b87068d2/tufup.pdfIn PDF document text
    • http://gediripu.pbworks.com/f/perimeter_of_polygons_worksheet_grade_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8713b84-2e0a-4f03-9563-35c913b5362a/bobcat_badge_for_cub_scouts.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_off0000e6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A9 5808 bytes
SHA-256: 84eb9f6d91bed110315a7b3483a85df52fe96d50011366c747dc3c94b85cf60c
font_01_sfnt_off0000fa6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6C 10400 bytes
SHA-256: 842c6fe046fd3cae6a0178e274b8d5aefe30b3488af8c31d16eda7dbf3b46df1