Malicious PDF — malware analysis report

Static analysis result for SHA-256 88fc86d8136d1732…

MALICIOUS

PDF

67.0 KB Created: 2021-04-05 19:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: bcc23531aa6dfccf24f7fe10e0064b53 SHA-1: f1f55a164f63dc27f0259dff8a8e37d3003e9a03 SHA-256: 88fc86d8136d17324bce26ceec8b3a1ccd024cb7ba8903edc65ba127b59faf21
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to direct users to potentially harmful sites. The ML classifier and ClamAV detection further support its malicious nature, indicating it's likely a phishing or malware distribution lure.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/123?utm_term=colchicum+plant+information In PDF document text
    • https://cdn.sqhk.co/xijisejes/dDicegf/moto_rider_go_highway_traffic_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lokovipazal/Nji2LOx/minecraft_among_us_map_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3531b088-7965-4511-a5b4-412fe9190f67/how_to_use_a_green_screen_in_imovie_on_ipad.pdfIn PDF document text
    • http://mikijanux.atwebpages.com/antarctica_countries_list.pdfIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_99703fcc1b0c410db22c5909458456cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6efb09a3-fb15-4d9b-9371-1273886d0a66/how_to_draw_a_simple_flying_dragon.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/dudarimun.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/37374295318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90db6ab7-fc71-4407-8c31-80572d382ad9/jonowibekinumapixe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c9c4f32-e9e6-4eec-909c-7d6d081a6183/nezezobuvepeseriwag.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/how_to_change_toner_cartridge_in_brother_dcp_7040.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/sitogejedigejaxupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59bfa171-8add-4edb-b0ef-17bc024888cc/15408833016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbcb0cba-abab-47d8-b81a-caf52169be5b/jezid.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/analytical_paper_guidelines.pdfIn PDF document text
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_bd27c8b246044997961088edc6f66809.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b50272ec-b799-4552-b2bb-921a44012ace/what_does_at_termination_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c3899b1-50cb-4ae6-b144-3d44ecc336cf/xopukokekuw.pdfIn PDF document text
    • http://bafuwujix.atwebpages.com/auto_dwg_to_converter_serial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3496c9ce-a2f9-49db-905d-7c0d3dd8ab30/31089707696.pdfIn PDF document text
    • http://kapowuxivi.atwebpages.com/zugajerixa.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_off0000ccaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAF 4980 bytes
SHA-256: 0d06b830977dba66244f3a8c36e5d633d224252ef03c093d2e1e941ea2799a24
font_01_sfnt_off0000dd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 9800 bytes
SHA-256: 74f48f79f70b82b4f356f1d49b1e051c2b335c4278ce8b6a18ba545d21d1b02f