Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a28f6470a824d9d…

MALICIOUS

PDF

94.6 KB Created: 2021-03-01 16:47:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a8d920383615e44f84f232f060960887 SHA-1: 21d26d092afb8ae2fb5b790aebd6d85085073763 SHA-256: 0a28f6470a824d9d32af788c18012639dadbdb8ebedee842bf8cde99b8fe9333
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a "PDF_SEO_LINK_FARM". The document body, though heavily obfuscated, contains text related to "Bosch dishwasher part number breakdown", suggesting a lure to disguise the malicious intent. The presence of external URIs and the ML classifier's high confidence score indicate a phishing or link-farming attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/award?keyword=bosch+dishwasher+part+number+breakdown PDF link annotation
    • http://vakafubetax.iblogger.org/36884911413.pdfIn PDF document text
    • http://jisewuk.22web.org/how_to_find_the_volume_of_water_in_a_graduated_cylinder.pdfIn PDF document text
    • http://xivixevikid.iblogger.org/internet_service_provider_wordpress_template.pdfIn PDF document text
    • https://zademufexek.weebly.com/uploads/1/3/4/7/134765537/7581623.pdfIn PDF document text
    • http://kudorifet.22web.org/mlindo_the_vocalist_amablesser_mp4.pdfIn PDF document text
    • http://salukapebuke.iblogger.org/army_lesson_plan_template_word.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
    • http://fenetidataj.rf.gd/fowobawawinefifetobi.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/emergency_action_plan_template_for_small_business.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/99_asmaul_husna.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/18012061152.pdfIn PDF document text
    • https://s3.amazonaws.com/gatazeromij/gulimose.pdfIn PDF document text
    • http://guxajez.rf.gd/placa_dentobacteriana.pdfIn PDF document text
    • http://lukigek.rf.gd/sikapobivububisir.pdfIn PDF document text
    • http://dafiwogi.rf.gd/greensleeves_piano_easy_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/mededadekojuva.pdfIn PDF document text
    • http://zafurug.epizy.com/access_point_names_greyed_out_android.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/20675283009.pdfIn PDF document text
    • http://sabuxixu.epizy.com/61215111943.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/internal_approval_note_format.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_off0001274b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274B 5508 bytes
SHA-256: 08187bf4899bc88b53c4155f61eee2a4f38b37146f0acb4686791ac0812042f8
font_01_sfnt_off000139db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DB 10820 bytes
SHA-256: edccb7aeec4465b28bb0bc78edec1f2eb6df9b8c5889e3be2ac4404002c64c17
font_02_sfnt_off00015ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EA1 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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