Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29c43a8941b4602…

MALICIOUS

PDF

75.5 KB Created: 2021-03-26 09:02:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5cd9f6560d5ce44abd90044bdc660717 SHA-1: 3d454952f8d8a9c8c3813e87a1c0e51cb869b760 SHA-256: a29c43a8941b4602d9746d9e1297af860a89e9d5636f1f78be665db8c91a5e45
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 0.9991

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
  • 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://seumenha.ru/123?utm_term=amravati+city+map PDF link annotation
    • https://nofefikow.weebly.com/uploads/1/3/4/5/134510094/06a7cad.pdfIn PDF document text
    • http://votapusi.mypressonline.com/rujesip.pdfIn PDF document text
    • http://ch-data-2a8fv9s.pw/accounting_basics_an_introduction_for_non_accounting_majors7xmyg.pdfIn PDF document text
    • http://bivaxosufuxibo.mygamesonline.org/data_interpretation_questions_with_answers.pdfIn PDF document text
    • https://zujuwedidikaf.weebly.com/uploads/1/3/4/3/134375258/nufejam_pifusaj.pdfIn PDF document text
    • http://storeplus.pro/75288561824l0pt6.pdfIn PDF document text
    • http://talkme-news.info/nhl_playoffs_2019_resultskndjg.pdfIn PDF document text
    • https://bodosimif.weebly.com/uploads/1/3/3/9/133999894/4310143.pdfIn PDF document text
    • http://apparentlyopt.com/neloxepeengv.pdfIn PDF document text
    • http://lofajemami.sportsontheweb.net/lowrance_elite_5x.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/1166653248.pdfIn PDF document text
    • https://sexeduju.weebly.com/uploads/1/3/5/3/135327292/tituxakogugeguwob.pdfIn PDF document text
    • http://piwulag.sportsontheweb.net/cut_and_paste_math_worksheets_for_1st_grade.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/fae5a80e-65a5-447b-9f08-7032a255e3e6/93345386827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c8e292f-5151-4073-9910-f3cb29e477d4/28097553970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68d33ec2-66d2-44c8-8fb8-a808b8cde987/state_and_colour_of_halogens_at_room_temperature.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58a7363c-d2b7-4230-b41d-54e9e0439b1f/what_is_the_purpose_of_bookmarks_in.pdfIn PDF document text
    • http://xefiposokupama.myartsonline.com/36289663717.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ce78e5d-38dd-4d06-975b-5c70351604ab/vocabulary_power_plus_book_1_lesson_2_answer_key.pdfIn PDF document text
    • http://rorazizaxaf.atwebpages.com/ftii_question_papers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43cd6852-c14a-473e-9719-40de5de34396/descargar_el_cigarrillo_de_ana_gabriel_en_mp3teca.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aca7a60-e03b-4be7-b352-51f0e0bf8149/teamviewer_10_license_code_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4115512-06c6-41f6-ac8d-9a0b5f93d495/41702120105.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0084df49-c6d4-4ce8-9d83-642409d08199/dance_with_the_dragons_anime_gayus.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_off0000e996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE996 5020 bytes
SHA-256: 6c15689c6e62ba0266205b0e6dc052f9530885ed2ddc0d66dd9ad49df09936c9
font_01_sfnt_off0000faa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA1 10720 bytes
SHA-256: 570ee3c39ed79265690eaf842a910e5c7cf54b3086de04e5245468284adef6c8