Malicious PDF — malware analysis report

Static analysis result for SHA-256 75dc2bd77c903805…

MALICIOUS

PDF

85.8 KB Created: 2021-04-07 06:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 375890d0aaf06d81bc96ceb933181b38 SHA-1: 20ae43f50406f493dd121ecd19edae5534f63b0f SHA-256: 75dc2bd77c903805b3dcc3e76fbce606775c368e5d75960001ac3a0f93fb433d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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://resalured.ru/award?keyword=describing+people+s+appearance+worksheets+pdf PDF link annotation
    • http://pimebujeben.66ghz.com/15678781944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488572/normal_5fd2932faac94.pdfIn PDF document text
    • http://rerupebe.iblogger.org/current_trends_and_technologies_in_computer_science.pdfIn PDF document text
    • https://witowufagefalob.weebly.com/uploads/1/3/0/7/130738848/xudikizujopo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366407/normal_5ff76647636f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391315/normal_5fcb78adf2ea7.pdfIn PDF document text
    • https://xaweworamek.weebly.com/uploads/1/3/4/6/134610398/betakesonobumiz.pdfIn PDF document text
    • https://sofabavoxikavup.weebly.com/uploads/1/3/4/6/134636307/633c28303feab77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458421/normal_5ff2732ab988b.pdfIn PDF document text
    • http://gubevexezu.iblogger.org/7655464837.pdfIn PDF document text
    • https://nezubarenegutel.weebly.com/uploads/1/3/0/7/130776328/6b503468a625b.pdfIn PDF document text
    • http://feziweninepiv.iblogger.org/62279378211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391308/normal_6045141169cf1.pdfIn PDF document text
    • http://woziwowariv.sportsontheweb.net/biostatistics_for_the_biological_and_health_sciences_1st_edition.pdfIn PDF document text
    • http://vutunema.mypressonline.com/the_boy_who_painted_christ_black_short_story.pdfIn PDF document text
    • https://mefewenitili.weebly.com/uploads/1/3/1/3/131379946/3f5a986d8965f9b.pdfIn PDF document text
    • http://pogibofabut.getenjoyment.net/nosanebufilunutanetuva.pdfIn PDF document text
    • http://sisogelodaze.medianewsonline.com/bejegedasixorawiko.pdfIn PDF document text
    • http://zagejudivavi.sportsontheweb.net/already_just_yet_ever_never_exercises.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409801/normal_6002eba4de0d1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://befokube.rf.gd/harry_potter_5_sinhala_full_movie_download.pdfIn PDF document text
    • http://dipiwidafebezi.epizy.com/pecha_kucha_powerpoint_format.pdfIn PDF document text
    • http://niniwakuruvip.rf.gd/wojinek.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_off00010eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB2 5712 bytes
SHA-256: b668559ccaff41169ba0dcdbde8c867ce5603797ae18b3a90e48d994edf11d40
font_01_sfnt_off00012235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12235 11128 bytes
SHA-256: 512cf24c6f7ad1d7eaf64c541cb65944961fccfd3df5229424221de03a555092

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