Malicious PDF — malware analysis report

Static analysis result for SHA-256 f257a95c2a1c7d36…

MALICIOUS

PDF

79.9 KB Created: 2021-06-01 02:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6d4d7ff74eb3c87548844ff7fff3c4d2 SHA-1: 28219167719f107e9316b3490ed63f0e4d275f2c SHA-256: f257a95c2a1c7d36aefd4a1c9b0b8b515af931aad810f98d53e4a1cba7e45f5c
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are hosted on disposable domains or redirectors, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://oniceh.ru/pbw?utm_term=solucionario+lengua+castellana+y+literatura+2+bachillerato+anaya+pdf PDF link annotation
    • https://sizazadumaf.weebly.com/uploads/1/3/1/3/131398154/wujebik.pdfIn PDF document text
    • https://lefeputabewaro.weebly.com/uploads/1/3/2/6/132695219/botitatajizipesin.pdfIn PDF document text
    • https://kufaxalerix.weebly.com/uploads/1/3/1/4/131453821/fewatuwifewepav.pdfIn PDF document text
    • https://befapoge.weebly.com/uploads/1/3/1/6/131637854/ac43b10e.pdfIn PDF document text
    • https://bejakujenexal.weebly.com/uploads/1/3/4/8/134890937/1256816.pdfIn PDF document text
    • https://rikidunojig.weebly.com/uploads/1/3/4/4/134488605/2795827.pdfIn PDF document text
    • https://gokejaxax.weebly.com/uploads/1/3/6/0/136056436/dibukokuzo.pdfIn PDF document text
    • https://kekofujazedelep.weebly.com/uploads/1/3/4/8/134879672/nuvigok-rekofelowe-rufugi.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/dd745689-5926-4455-9d08-1413256165d8/compare_and_contrast_mitosis_and_meiosis_by_filling_in_the_venn_diagram_below.pdfIn PDF document text
    • http://kelivesas.pbworks.com/w/file/fetch/144435744/guava_family_travel_crib_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebbb4f69-2e4d-4128-983c-739b7cc31b35/nupefilopumedafereze.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144428940/how_to_use_my_proform_treadmill_without_ifit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a9fd726-c486-4cec-bd14-b35e9adeb25b/eliminating_wordiness_and_redundancy_worksheets_middle_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0594a87-d9f1-408a-8cc5-bd99c8330f74/66888755816.pdfIn PDF document text
    • http://togusan.pbworks.com/f/xisigewup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77cac4d6-c93a-468f-8248-b9f871368563/31831027982.pdfIn PDF document text
    • http://giresizuloki.pbworks.com/f/dinibimoxagap.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/f/tony_robbins_awaken_the_giant_within_book.pdfIn PDF document text
    • http://wuvebag.pbworks.com/w/file/fetch/144424722/pensar_rapido_pensar_despacio_libro_resumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06f0f551-7cc6-4743-9799-dcea90790107/ginakewunodorosabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c20260e6-05fe-48a6-86a0-887c9225757c/gewevodofawupowus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff2f394e-8325-4caa-8193-cebb5d6461a8/brawl_stars_leon_mod_apk_download.pdfIn PDF document text
    • http://xawaren.pbworks.com/w/file/fetch/144419163/developing_skills_for_the_toefl_ibt_intermediate_listening_answer_key.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_off0000f7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 5892 bytes
SHA-256: b6a2e72d3e50e74bbf742e5b025ebcc05f914c9466ee7d13f8aa80c18cbe9723
font_01_sfnt_off00010bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEE 10932 bytes
SHA-256: 89739e73b3b9c49eaadf0c150ab828df5194cc7ee09743ddee4491241034a26e

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