Malicious PDF — malware analysis report

Static analysis result for SHA-256 f65cb0fcbccec765…

MALICIOUS

PDF

76.1 KB Created: 2021-06-02 07:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4761011384bd540e81ae6f056cba3023 SHA-1: 80c53af5ac5c03cf322a17e24f78bb3decd44c1d SHA-256: f65cb0fcbccec765f01f74857bebd2cebe57440fbf7dd02efd4704bcf487803b
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 0.9992

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://jumiwimov.ru/123?utm_term=conclusion+for+microscope+lab+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374839/normal_6061ead6da9a6.pdfIn PDF document text
    • https://labopepiw.weebly.com/uploads/1/3/4/7/134747507/9748798.pdfIn PDF document text
    • https://vorevowupi.weebly.com/uploads/1/3/4/6/134633589/fijalota.pdfIn PDF document text
    • https://wuwonemuv.weebly.com/uploads/1/3/4/5/134589345/tizof_bemajitikerodu.pdfIn PDF document text
    • https://pidakobanaxob.weebly.com/uploads/1/3/4/4/134463411/7533447.pdfIn PDF document text
    • https://pebitazoma.weebly.com/uploads/1/3/4/8/134849778/fesekasufep.pdfIn PDF document text
    • https://sikufotoxatufik.weebly.com/uploads/1/3/4/4/134458503/zigifu_jovuxo_tobubof_gixojezel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379221/normal_606e9833ee442.pdfIn PDF document text
    • https://musegozaxugovu.weebly.com/uploads/1/3/0/8/130873783/vebabegami-liguf-zusenanu.pdfIn PDF document text
    • https://nivebisela.weebly.com/uploads/1/3/3/9/133997547/9026873.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460686/normal_6039f848523d7.pdfIn PDF document text
    • https://xinagaxigivawiv.weebly.com/uploads/1/3/0/7/130739766/1066401.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vifogajo.pbworks.com/w/file/fetch/144485103/the_wifes_lament_old_english_poem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ea3924b-eea0-48d7-bf2d-4e1a301d3957/lizodojasalivo.pdfIn PDF document text
    • http://fodorafirig.pbworks.com/w/file/fetch/144473937/how_to_calculate_break_even_point_in_excel_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08006677-c0b6-46a0-919d-6365c898e273/what_are_some_of_the_weirdest_names.pdfIn PDF document text
    • http://pefagisunel.pbworks.com/w/file/fetch/144484752/dodujiruxumerajamev.pdfIn PDF document text
    • http://zezimin.pbworks.com/f/when_did_all_i_want_for_christmas_is_you_come_out.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/f/83146544904.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/seginadodimagokigame.pdfIn PDF document text
    • http://fufitiruw.pbworks.com/f/adverbs_worksheet_for_grade_4_with_answers.pdfIn PDF document text
    • http://zufogopojut.pbworks.com/w/file/fetch/144489987/32250807631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0291a11e-73a5-44c3-b9fe-cff289bf48be/75731811574.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_off0000eae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE2 5208 bytes
SHA-256: 816dcd92a3b29e449ddda55ab60e9200ec0d1f4132c3c12d1824b9b494a7447e
font_01_sfnt_off0000fc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7B 10952 bytes
SHA-256: 40754a192bb10ae82a4a0efd003f0628d4d1d58fc443680ddd7cc449bef6375d

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