Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b195a7549bdfafb…

MALICIOUS

PDF

80.9 KB Created: 2021-04-20 04:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 743f82f53e98508e67efbb3b8bd6c74f SHA-1: b01b4a7b4f855edf55d035ecdefe209ffac3d735 SHA-256: 7b195a7549bdfafbcc867b8d39ade16b1dfc51523ec857938c3f571da2ab8c92
186 Risk Score

Malware Insights

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

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 0.9995

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://midufefew.ru/strik?utm_term=250+000+cad+to+inr PDF link annotation
    • https://cdn.sqhk.co/suvezadamut/hjm1Bij/emoji_love_live_wallpaper_hd.pdfIn PDF document text
    • http://fuxuvewaru.22web.org/chemical_bonding_multiple_choice_questions_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxinugad/iiid8gi/zixubotosododekeroxopam.pdfIn PDF document text
    • https://larojebuwovu.weebly.com/uploads/1/3/1/3/131382373/8809425.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/g7Egfhg/retepogigeraxiduzosovoso.pdfIn PDF document text
    • http://nefuwumimo.iblogger.org/blank_award_template_word.pdfIn PDF document text
    • https://palekamenagogu.weebly.com/uploads/1/3/2/6/132682235/2590518.pdfIn PDF document text
    • https://fokifukamanur.weebly.com/uploads/1/3/0/8/130874497/zejegulukasezitok.pdfIn PDF document text
    • https://cdn.sqhk.co/luzorisu/g0SCu0q/radejogaguwamibewukup.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/Dvidgjl/android_nougat_32_bit.pdfIn PDF document text
    • https://cdn.sqhk.co/pitadewedobu/dijhahb/69277884985.pdfIn PDF document text
    • https://tewetakejuduz.weebly.com/uploads/1/3/2/7/132740850/fcca9be8.pdfIn PDF document text
    • https://cdn.sqhk.co/seranowe/ChhaZtd/98445989517.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/bokelur/47218498979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa0c8b98-3b19-4916-b3bc-e8121f1bf4ae/gaguwitotume.pdfIn PDF document text
    • http://jeworobe.rf.gd/equation_of_a_circle_word_problems_with_solutions.pdfIn PDF document text
    • http://tulezij.rf.gd/by_buy_bye_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/xofedogaviwiwamepuxox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b263cd08-d9d4-4fd9-8ab2-ac18c43c618d/51873107132.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e05fd238-8fdc-4904-b6ba-7a33eb739f82/how_forests_think.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08501ceb-9a26-454c-8fa6-9de27394e183/gilomizejanapujub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79fa7177-80c1-4ede-bb5d-f6e0f453171d/how_do_i_identify_my_club_car_golf_cart.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_off0000e88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88E 5028 bytes
SHA-256: cb9607b57848ac7cbd6e6b1f8c84131283ce659d6e2030b68c3440db7359ebf1
font_01_sfnt_off0000f9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B2 11016 bytes
SHA-256: 21f848ed8dfa5e51af1bb70d6f55bdf4ff3ec8c116be17257b20fc27f9c00790
font_02_sfnt_off00011fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB0 16164 bytes
SHA-256: 6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3