Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4730e6ce9d9463…

MALICIOUS

PDF

79.3 KB Created: 2021-03-19 14:43:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 649dae989292557f0ff8aa9d2a665e28 SHA-1: 24e4d03a3f15e25a119c11287d857117f4bbd747 SHA-256: 3f4730e6ce9d94639737404155db0278421949f7ae28bfac2eb89f599cf7349c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URLs pointing to other PDF files, many hosted on disposable domains. The primary purpose appears to be SEO manipulation or distributing further malicious content, rather than direct user interaction within the document itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/wix?keyword=icra+preference+based+gait+exoskeleton PDF link annotation
    • http://findfreegirl.com/fajanuxedozebodifuduzoru9dm3e.pdfIn PDF document text
    • https://kesevaze.weebly.com/uploads/1/3/1/3/131383297/pipemowivem_jirutakuve.pdfIn PDF document text
    • https://negapisege.weebly.com/uploads/1/3/4/6/134635707/f6140dd673.pdfIn PDF document text
    • http://gdztut.com/180965430094amg3.pdfIn PDF document text
    • https://beretukajawedu.weebly.com/uploads/1/3/4/7/134713042/kudir.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/4th_grade_reading_comprehension_packet.pdfIn PDF document text
    • https://duvutonog.weebly.com/uploads/1/3/6/0/136020002/dupojomekilolox.pdfIn PDF document text
    • http://vimobewawulipiz.mypressonline.com/77325791008.pdfIn PDF document text
    • http://gipogup.sportsontheweb.net/english_communication_lessons.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_ae84cee5bc7f4257a4d904c68b597636.pdf?index=trueIn PDF document text
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_166545e9fa7f4cc59fbafe4295d04b7d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f297dfc5-5a1b-447c-866c-e00c0406f06c/kwikset_smartcode_916_z-wave_smart_lock_battery_change.pdfIn PDF document text
    • http://xomapagovujux.atwebpages.com/lineas_horizontales_y_verticales.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/54880964408.pdfIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_6dc37136ece94cfbbd84bd266d4a6118.pdf?index=trueIn PDF document text
    • https://37628037-8ed2-4234-80bf-d3204aa213b5.filesusr.com/ugd/c4dbd3_712473fc71444d9bb82bfbecaaae9fff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dc15031-73b2-4c5a-8fa3-1ee61dc8d571/81397507672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1702dc88-c731-4c7a-a85c-7a008c8dd5c7/red_dead_redemption_2_hidden_trophy_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcd286a0-2e40-44a9-bbd1-89631ee96ce0/what_does_the_word_behind_closed_doors_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/500bb7fc-10fe-405d-97a8-640337c1815a/oxford_english_dictionary_offline_free_download_for_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/springer_books_free.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/english_children_s_video_songs_for_free.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_off0000f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 5532 bytes
SHA-256: 9e23952bfa4bb5014ce162baab4bef14da8e3fa2bf25f9047558c798af0642b1
font_01_sfnt_off000109bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BD 11100 bytes
SHA-256: 80e36ffe61d7fde3e0fabff966df347d050a9b4b24b2fb68fdd1700387ec8a17