Malicious PDF — malware analysis report

Static analysis result for SHA-256 25437aa8d2bc87a7…

MALICIOUS

PDF

79.4 KB Created: 2021-03-29 02:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c5bdaff44749c4a7e6c207921a44dd43 SHA-1: d062030fc54aa96d765087ea4c4aa3b6a689b8a4 SHA-256: 25437aa8d2bc87a7ef15d73c33423a2b3f6ae7b19246deaf0b6f1a6aa3ddd73a
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware-hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/award?keyword=sch%25C3%25A9ma+alimentation+pc+atx+pdf PDF link annotation
    • https://vamawawu.weebly.com/uploads/1/3/0/8/130874524/7be3ade46.pdfIn PDF document text
    • https://cdn.sqhk.co/zozimevoket/eRqsjjc/mini_shooters_battleground_shooting_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373517/normal_6047dfaf4b43f.pdfIn PDF document text
    • https://cdn.sqhk.co/bidekidarub/Eib1tz3/riniwilowosaxas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468540/normal_603429c110e35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462073/normal_602654904fca6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367617/normal_60521b7b8321e.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/ahd6Khj/68197579590.pdfIn PDF document text
    • https://saxipapes.weebly.com/uploads/1/3/0/7/130738636/gifujilamikubi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368768/normal_60343e8481bf5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493553/normal_5fce95e4542c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369334/normal_605faa5126b6c.pdfIn PDF document text
    • https://cdn.sqhk.co/jagugide/9LjdRjh/fruit_dash_mod_apk_noclip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492875/normal_5fd789cd4f470.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://puzasapexuwuju.epizy.com/cost_comparison_spreadsheet_template_excel.pdfIn PDF document text
    • http://xigatif.epizy.com/69743862890.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/kuvabukojezinagag.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/ripovoranowimib.pdfIn PDF document text
    • http://zoxokukazo.epizy.com/sociology_anthony_giddens.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE638 5224 bytes
SHA-256: 1b7f75fda5fba8bfe5b35005f924ac838636f7e28ec6aa46bd5d5db6370d1beb
font_01_sfnt_off0000f788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF788 12732 bytes
SHA-256: a3d360a18310a9d620d61421030b09b4a86094217d17eace36be77a1b90e3e1d
font_02_sfnt_off00011fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC0 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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