Malicious PDF — malware analysis report

Static analysis result for SHA-256 468f8ddb5a5d12cd…

MALICIOUS

PDF

74.0 KB Created: 2021-06-10 20:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 49179b12cdd1838958a13a1b979249a5 SHA-1: 9465690fd9e5501683b6fe4353f41ffe044a2435 SHA-256: 468f8ddb5a5d12cd8e528764dbcbb0fa8724194398dd11919b8b57dbe0514512
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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://irlanc.ru/pbw?utm_term=class+11th+science+biology+notes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375896/normal_60c1069639bcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457006/normal_604bac97f0bca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375522/normal_6009d8799986b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418199/normal_6002dec0107c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_606d272547e6b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://palixazoke.pbworks.com/f/judgement_ps4_batting_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1a35db8-963a-46ad-b968-6b7129cc9d20/whats_the_best_thing_to_cook_in_an_air_fryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/898daafd-6f1a-4564-b9a7-e0c97d6e182a/sat_words_for_6th_grade.pdfIn PDF document text
    • http://tewabavuxate.pbworks.com/w/file/fetch/145001703/30343844639.pdfIn PDF document text
    • http://kikipudojuzo.pbworks.com/w/file/fetch/144928443/free_diamond_ml_file_script.pdfIn PDF document text
    • http://pebenuziwi.pbworks.com/w/file/fetch/144548352/how_do_you_wind_an_atmos_clock.pdfIn PDF document text
    • http://ronakiko.pbworks.com/w/file/fetch/144537783/ordering_fractions_with_the_same_denominator_worksheet_tes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ee3e171-8e65-4d93-b7a2-d3db3f7dfa6c/christmas_quiz_questions_printable.pdfIn PDF document text
    • http://garewewaziwu.pbworks.com/f/avantapure_water_softener_manual.pdfIn PDF document text
    • http://biwonuv.pbworks.com/f/teri_ankhe_bhul_bhulaiya_mp3_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50332e3f-f7a5-4ca3-a7ac-c9372489f9bb/nupew.pdfIn PDF document text
    • http://zuvuzut.pbworks.com/w/file/fetch/144931623/offline_battle_royale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c14d51e9-aa81-4764-9bda-4913ef2467e7/42516532506.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba4fd837-fd82-4243-8fec-2fe9fe9714e6/fivago.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_off0000e562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE562 5164 bytes
SHA-256: 9d7e445a0a7f1d867612142c3e6e126b1dc6bca46a9b584d6d89092d707317ee
font_01_sfnt_off0000f6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FF 10596 bytes
SHA-256: d24c83d02973637f68a07207d74633808a439a08fea69ad6dc62420f7490fb0d

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