Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9c95d9495547c6…

MALICIOUS

PDF

84.1 KB Created: 2021-04-02 19:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: dc73fbe5ed2235f2887dfbe196af1fa7 SHA-1: 170f01cece52b124c4a5c1ab59d4be774aadfbd8 SHA-256: da9c95d9495547c6726a5a27b0d643ea0e59d765373bfc9a1bf056d13827d5a6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and a potential phishing or SEO spam document. It contains numerous external links, many hosted on disposable domains, designed to redirect users to other sites. The ML classifier and ClamAV also identified it as malicious. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to drive traffic to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://leonvi.ru/award?keyword=mepilex+border+heel+pdf PDF link annotation
    • https://cdn.sqhk.co/wexunabem/Whiijih/briggs_and_stratton_450_series_parts_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/RjeU7U9/xajupasulovobixido.pdfIn PDF document text
    • https://cdn.sqhk.co/tokebamojos/5vgfzhb/pokemon_cards_for_sale_online.pdfIn PDF document text
    • https://gijorumofe.weebly.com/uploads/1/3/4/7/134764035/716125.pdfIn PDF document text
    • https://cdn.sqhk.co/moxoxitij/hWE1zXV/baxofudu.pdfIn PDF document text
    • https://zujituxo.weebly.com/uploads/1/3/2/6/132681889/tekupivufegijox.pdfIn PDF document text
    • https://cdn.sqhk.co/zotipimesaza/XigKhh0/81446518980.pdfIn PDF document text
    • https://cdn.sqhk.co/mugodetutag/iiThchf/sling_bags_for_men.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470982/normal_5ffa280a25312.pdfIn PDF document text
    • https://cdn.sqhk.co/rogudokives/jhgfWdL/suvakaj.pdfIn PDF document text
    • https://cdn.sqhk.co/nimuxugemu/ichgidM/real_driving_sim_game_mod_apk_android_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417206/normal_600afcfe60298.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/Zjagegh/gemumanuramorixunonafiv.pdfIn PDF document text
    • https://pexigupor.weebly.com/uploads/1/3/4/9/134901766/fiwudoju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367903/normal_5ff4fc8e2bea0.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxodokoju/3GSlibu/nuclear_weapon_definition_in_history.pdfIn PDF document text
    • https://ruxapumuful.weebly.com/uploads/1/3/4/6/134682584/wexaxivawonu.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/gr0jfgh/disneyland_smile_sheet_music_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455669/normal_5fd77edfaee67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391037/normal_5fe5ed7213177.pdfIn PDF document text
    • https://kojelokawuzu.weebly.com/uploads/1/3/4/3/134341929/cebc8c5a9.pdfIn PDF document text
    • https://cdn.sqhk.co/lewuravasu/QgdSk3L/cute_talking_bird_videos.pdfIn PDF document text
    • https://cdn.sqhk.co/visesefider/jhtleVm/samsung_clp-_310n_driver.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/kubedukowug/fraction_and_decimal_worksheets_grade_4.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/yamaha_ypg_535_price_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/xukesurutonorativapepi.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/walmart_near_me_opening_hours.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/trumpet_voluntary_music_sheet.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_off0000f596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF596 4956 bytes
SHA-256: 0155e2768c50ad1e85af63ba47662b497d064028f25a74482de6912cc1c2a624
font_01_sfnt_off00010675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10675 25028 bytes
SHA-256: 40e454e628265b712bfa7dd8f0e9ded8375e174222019d859a12eb8ec73fbe7a

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