Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5c5d19c9ab657d…

MALICIOUS

PDF

70.6 KB Created: 2021-06-03 06:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6666337c18531c20bc47356a16a32e39 SHA-1: 2576a2ad6f6f3ad69fab64aa581801f71f9374da SHA-256: da5c5d19c9ab657dcf3a7e00d1acb3e0c4e2d2b6089c5ee53476714b2a9a8a8a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs pointing to disposable hosting services, suggesting a link farm designed to redirect users to malicious content or downloads. The presence of a URL with a 'traffic rider apk' term indicates a lure for potentially unwanted or malicious applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://nomylo.ru/pbw?utm_term=traffic+rider+apk+day%25C4%25B1+hile+indir PDF link annotation
    • https://pememeva.weebly.com/uploads/1/3/0/8/130874233/gezuro-xasolun-pidifemasixabav.pdfIn PDF document text
    • https://zilununuta.weebly.com/uploads/1/3/4/4/134490292/1937004.pdfIn PDF document text
    • https://dexugagemer.weebly.com/uploads/1/3/4/7/134715037/kasemipuviwakixisewu.pdfIn PDF document text
    • https://woloxujujesif.weebly.com/uploads/1/3/4/7/134716607/7427059.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417128/normal_5fd036c4a139f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426416/normal_5ffb59c88e942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481831/normal_6023fe4ab8635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416301/normal_60647a87e4a4f.pdfIn PDF document text
    • https://kawuloxegulul.weebly.com/uploads/1/3/4/3/134389306/f8235d607b95448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470402/normal_601f2469b0f9f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xalomuzavege.pbworks.com/w/file/fetch/144431943/actividades_de_enfermeria_en_cuidados_inmediatos_del_recien_nacido.pdfIn PDF document text
    • http://numefen.pbworks.com/w/file/fetch/144534825/83892029088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02d9b866-6eaf-45a1-be82-4d40adb223e2/jagatuxepagoni.pdfIn PDF document text
    • http://jevibufile.pbworks.com/f/vizukevumejer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d56b3a6a-928d-4e7b-a2c6-e26b409b58ac/food_safety_temperature_regulations.pdfIn PDF document text
    • http://jevibufile.pbworks.com/w/file/fetch/144543156/3613305474.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/734ae2ae-a9bf-4ddf-bc23-a73f46e0e840/ryobi_cordless_pole_saw_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d7c0f36-e493-4dfb-95ce-03cfafc7c200/59161112048.pdfIn PDF document text
    • http://nosiravuga.pbworks.com/f/62259548111.pdfIn PDF document text
    • http://wusagem.pbworks.com/w/file/fetch/144440556/modern_auditing_and_assurance_services_5th_edition_solution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d1a1021-981a-4909-94d5-23cbb87d51c6/samsung_tv_code_service_menu.pdfIn PDF document text
    • http://jitilabajeko.pbworks.com/f/42545193911.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76C 5212 bytes
SHA-256: e3b7fac09355543e597ac57aaed44a3a04a0b33181f928bf16502d1bf8ccb50c
font_01_sfnt_off0000e934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE934 11844 bytes
SHA-256: 343b6a711539e1e4c992977a3a0a6646eabff5508b69f46690fd2da9474cc828

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