Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89b0bd4118df35a…

MALICIOUS

PDF

83.4 KB Created: 2021-03-14 07:12:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 61510619309a4cc03538b9ada5bb1e59 SHA-1: 8a91130c9d112d2cc596f4e3a4c41e58554335ba SHA-256: b89b0bd4118df35a9905e9aec7f48d48d931e43d1ceed1a5ead36561856e7a42
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a phishing or malware distribution attempt. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to obscure the true destination or host malicious content. The presence of embedded URLs and the ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/wix?keyword=core+connections+algebra+answer+key+chapter+8 PDF link annotation
    • https://cdn.sqhk.co/suxujaba/fmgdMii/catan_universe_multiplayer_modes.pdfIn PDF document text
    • https://cdn.sqhk.co/xotosobupis/ggio37A/autocad_2007_32_bit_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/dIp3Wij/airline_manager_4.pdfIn PDF document text
    • https://cdn.sqhk.co/mojekuvugise/hcPaY3a/kotavi.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/gdSIAgj/general_knowledge_quiz_questions_and_answers_2019_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/zunowexafa/hbghibb/53064073428.pdfIn PDF document text
    • https://cdn.sqhk.co/fikubife/8WgjaBA/mafia_city_of_lost_heaven_characters.pdfIn PDF document text
    • http://duzixofiwisegi.mygamesonline.org/the_general_c_s_forester.pdfIn PDF document text
    • https://cdn.sqhk.co/kejofuvata/TuihMDm/earl_of_sandwich_tomato_soup_nutrition.pdfIn PDF document text
    • https://cdn.sqhk.co/solalokazili/dheWgjn/naxeex_superhero_v1._7_mod_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/tubafejog/fheBgdF/princess_beauty_makeup_salon_games.pdfIn PDF document text
    • http://jonipifenukiz.mygamesonline.org/42447501065.pdfIn PDF document text
    • http://wisagomojinux.iblogger.org/trimble_controller_tsc2_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/vajirasavuz/7hbQgdo/59077515177.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vejawojifig.epizy.com/canadian_fundamentals_of_nursing_study_guide.pdfIn PDF document text
    • http://pavafisufopu.myartsonline.com/security_officer_training_manual.pdfIn PDF document text
    • http://wamivofubamaxit.epizy.com/bellerose_pro_font_free.pdfIn PDF document text
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_3e93da348a1b4b98b83b3c996a1ef731.pdf?index=trueIn PDF document text
    • https://1f49b3f1-4b09-4f89-88df-03804352fc9a.filesusr.com/ugd/a51aec_ba27f464c6c442c4bb37ad6fe4555508.pdf?index=trueIn PDF document text
    • http://zexaxujivu.rf.gd/what_is_hell_quotes.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_off0000f2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F9 5692 bytes
SHA-256: f619e2c05ea60226826f01ee0dfedd9f316e2a4482096bf72bc20090c70dc714
font_01_sfnt_off00010661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10661 10580 bytes
SHA-256: 2c99f7c2d6ce9123fa4a15be71e10682235a193ad2565c75c12f5259994dd9d4
font_02_sfnt_off00012aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA1 16076 bytes
SHA-256: 94916db2523957c569185dc43e39b7d8e6513ef84e33c61248e8a3c36842bb28