Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f8d5419da992a35…

MALICIOUS

PDF

92.8 KB Created: 2021-05-03 18:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 517734849c5f33500431d628612fbdb3 SHA-1: 3fefb67b9baa3b4298903593ea97526908d82390 SHA-256: 2f8d5419da992a35b633ecabb28400dc8be5a8397294c9382fca5b0641999d48
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://seumenha.ru/strik?utm_term=what+can+cause+bleeding+during+childbirth PDF link annotation
    • http://xevojifixifepi.scienceontheweb.net/12621710025.pdfIn PDF document text
    • http://muzomabavima.medianewsonline.com/td_atomistique.pdfIn PDF document text
    • http://mezajozugabaso.getenjoyment.net/8849632132.pdfIn PDF document text
    • http://tobafiga.medianewsonline.com/por_carreteras_secundarias.pdfIn PDF document text
    • http://zebiripu.mygamesonline.org/jobepejuzakiz.pdfIn PDF document text
    • http://pidijajuwupurop.medianewsonline.com/37618835161.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/what_part_of_new_york_has_the_highest_crime_rate.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zudoxovup.rf.gd/what_does_a_trilogy_ventilator_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3b182aa-5379-47ae-9131-bb37e2e56b6e/queue_data_structure_program_in_javascript.pdfIn PDF document text
    • http://giwuvupajot.epizy.com/90960480959.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ad284c3-0b29-4dbf-a0f1-c39f05721d68/harry_potter_first_edition_hardback_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c08acdd-e58a-4f2b-b907-acd3c9040f87/how_to_play_croquet.pdfIn PDF document text
    • http://zipazakixodi.rf.gd/o_que__autismo_em.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ccb342b-c4ec-49cd-baf7-f26032cf1709/prachi_english_grammar_book_class_6_solutions.pdfIn PDF document text
    • http://xomutojekes.myartsonline.com/pdf_amdal_di_indonesia.pdfIn PDF document text
    • http://pejemevogoge.myartsonline.com/23844690696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b5edcf0-d051-44e8-8784-58907fe5a445/the_tipping_point_sparknotes_chapter_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84638f8c-5afe-45bb-82ab-0e09a7af712d/neat_scanner_model_nd-1000_manual.pdfIn PDF document text
    • http://zawuzujuw.epizy.com/94823975401.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_off00012bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB8 5352 bytes
SHA-256: 1d3c98b9106d8d38e74278027cb7756a6b69e2426acce8b0b37a9d56deaa98aa
font_01_sfnt_off00013def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEF 12176 bytes
SHA-256: 29e3ad7fe208a3fa9f3ba43ad5f5e9712f2f10869a5ca26dfd08464f60c9b8b6

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