Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a99f4e1a4363bc…

MALICIOUS

PDF

97.4 KB Created: 2021-03-19 16:31:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f8e555079cd5ce880728e4708ef0c6e9 SHA-1: 571236074c4530326aaf3632c68e2d98c7dec605 SHA-256: e4a99f4e1a4363bce1c96823fba9c135c6cbe47cb4adbed5135b26d2a688acc7
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 0.9988

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://maypoin.ru/award?keyword=tipos+de+cirrose+pdf PDF link annotation
    • http://rigoditibalun.mywebcommunity.org/antigone_exam_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420767/normal_6029d322e6e06.pdfIn PDF document text
    • http://beguwidip.scienceontheweb.net/beautiful_in_white_satb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498345/normal_5ffc2c040164b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490371/normal_5ffe8310be33f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485800/normal_5ff7090495fea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491155/normal_60065df4887fd.pdfIn PDF document text
    • https://cdn.sqhk.co/siboxowimu/FyuzidC/polysphere_bts_puzzle_games.pdfIn PDF document text
    • http://gomesuzos.mypressonline.com/kiwesomevaviloworifawelov.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/comment_in_visual_basic_code_excel_begin_with.pdfIn PDF document text
    • http://sufawevugut.mywebcommunity.org/fizarovukodinovub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402936/normal_603189d5520d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413693/normal_5fde532736e03.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/zPhf8ie/rutogaj.pdfIn PDF document text
    • http://vevapefin.sportsontheweb.net/76863261982.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fikuvine/mosejimafuteniwabafapino.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/what_is_the_central_idea_in_brendan_nelsons_sorry_speech_token.pdfIn PDF document text
    • http://kojuvurapamox.myartsonline.com/partitura_de_cavatina_para_guitarra.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/kafojagekutu.pdfIn PDF document text
    • http://kopolug.myartsonline.com/69984639194.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/81123418248.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/aashiqui_2_audio_naa_songs_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/29820688012.pdfIn PDF document text
    • http://jimomurapujivo.onlinewebshop.net/chinese_alphabet_in_english.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12672 4856 bytes
SHA-256: 40da3ae6048c97d80effc6723b2310d74d8fb81ad9c61c76a3ba42fc3f93fc93
font_01_sfnt_off0001370a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370A 13924 bytes
SHA-256: a9b8e1ad31846a608479b7d63699b1984994a7eea629b86047cefd3c08ddf0da
font_02_sfnt_off00016136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16136 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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