Malicious PDF — malware analysis report

Static analysis result for SHA-256 25471a15071c659f…

MALICIOUS

PDF

87.0 KB Created: 2021-03-22 16:04:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 8b9ce9d69ef949ac367bd5667ee254a5 SHA-1: 399a9d47158c2b90d08e3d2cbb759a972384a463 SHA-256: 25471a15071c659fba3ac479a069c43f3ddd7fb6f00bd4d9b91d8973777a9606
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically pointing to `https://dafemum.ru/award?keyword=back+pain+in+pregnancy+exercises+pdf`. The document's structure and the presence of numerous links on disposable hosting suggest a phishing or scam attempt. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to facilitate malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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/award?keyword=back+pain+in+pregnancy+exercises+pdf In PDF document text
    • http://gumimexolekedid.22web.org/kafukumoxof.pdfIn PDF document text
    • https://cdn.sqhk.co/fukaxaxod/VxjhVhc/82416275097.pdfIn PDF document text
    • https://nezikuwetop.weebly.com/uploads/1/3/5/3/135346993/dakogokaxotodibet.pdfIn PDF document text
    • http://cabinetsly.xyz/behold_the_dreamers_essayaapwd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420250/normal_6015573466b27.pdfIn PDF document text
    • http://inmyshtangen.xyz/what_is_the_21_day_diet_challengei7qx4.pdfIn PDF document text
    • https://jabudebixeref.weebly.com/uploads/1/3/4/3/134398441/9986430.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377414/normal_60340508d3772.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415534/normal_602236b7d5222.pdfIn PDF document text
    • http://microbladingcertificationdfw.org/601755569865hdv4.pdfIn PDF document text
    • https://zupevinar.weebly.com/uploads/1/3/0/7/130739631/soduketitozoxe.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/qPjhhG5/fofev.pdfIn PDF document text
    • http://freshmind.net/qual_a_lngua_mais_fcil_de_aprender_para_quem_fala_portugus9v4hy.pdfIn PDF document text
    • https://befuvabesuwab.weebly.com/uploads/1/3/0/7/130740391/jesev_begenimenoluto_tulilexi_rorukor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382643/normal_5fcae93f89d08.pdfIn PDF document text
    • https://cdn.sqhk.co/besogevipadi/FzhaTld/87990203948.pdfIn PDF document text
    • https://pepigapipewoma.weebly.com/uploads/1/3/4/0/134000130/gavonufabexeliso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417519/normal_6026270cf00b3.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/cefb7176-0564-42a4-b69f-27fff2738122/masterbuilt_digital_electric_smoker_recipes.pdfIn PDF document text
    • http://lujolugajejizog.epizy.com/ak_letter_images.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eec2311-e4b0-447b-836f-57d94f146723/best_replacement_battery_for_samsung_s4_mini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe861008-1a61-479d-920c-fe3f3eac7be9/83102759943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22850e13-249c-4bea-aa5a-ea6d64aa601f/pefixizukorurogezivezopig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06637865-008b-4bd2-b614-48a7579f8424/horolovar_400_day_clock_repair_guide_download.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_off0001157e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157E 5572 bytes
SHA-256: bee51b418992b91fd6b59cfeb6d44573632e27917c3a04e71a54ec909cd081c0
font_01_sfnt_off000128a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A0 11140 bytes
SHA-256: 2df13bb953642c22fc98dab581e89aff8ee7b9c624727f0b5d6901c5012aaf48