Malicious PDF — malware analysis report

Static analysis result for SHA-256 5868c59399e38b32…

MALICIOUS

PDF

75.1 KB Created: 2021-03-29 15:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cf10191a49e97f0ce5a59112b250dad5 SHA-1: c1b4be3e5a3ff8ceee49b6b58160899e855d1a5f SHA-256: 5868c59399e38b32413cae70a690a2c9c1b1a0557810d71213eb693b5cda5af9
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector pointing to 'dafemum.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'free harvard business review case studies pdf', suggesting a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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=free+harvard+business+review+case+studies+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4452607/normal_6052ab61e7606.pdfIn PDF document text
    • http://starconflict-game.ru/zubekibadaposijijagegist4eq0.pdfIn PDF document text
    • http://kayikciakademi.com/liquidation_report_form_coahzw67.pdfIn PDF document text
    • http://vkysnaya-eda.site/tinabodunebycqn.pdfIn PDF document text
    • http://collegegraduatecentraldating.com/employee_self_evaluation_sample_answers_executive_assistant4ry7a.pdfIn PDF document text
    • http://hiziryigit.online/88837111261hi4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422884/normal_605c222e46ea7.pdfIn PDF document text
    • http://physcoo.com/88126835055vrac6.pdfIn PDF document text
    • http://stroymarketmetal.ru/why_did_they_kill_carlo_in_the_godfatheru9bga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425009/normal_601e0c44bad42.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_995a7bfed9ff4f86926246ba2910fb18.pdf?index=trueIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_d8eea39fe262466ab2a66d9586b31685.pdf?index=trueIn PDF document text
    • http://kezitiw.epizy.com/problem_solving_in_mathematics_book.pdfIn PDF document text
    • https://69a7f268-727d-4112-ba4f-a3538cc856be.filesusr.com/ugd/9a0d60_33d360e5779c4b6fb41e276645fb4d6a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbb77d1b-0687-48d8-99a1-15d8904eb9da/zisives.pdfIn PDF document text
    • https://9177b9cb-4c70-42bd-a9e0-27a1bf53b67b.filesusr.com/ugd/9baf76_4e5d7f12882447538a5426da3399455b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c219934-9b74-40fd-a8a3-8ef83cfd1535/arbys_allergen_menu_2020.pdfIn PDF document text
    • http://bumufemukelogik.epizy.com/lumibelozusidadobu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/196e4785-baf7-4e88-bbe5-f39695e474b7/pokemon_sun_and_moon_tv_show_cast.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AB 5456 bytes
SHA-256: a235ab39300975cf191e0919262c2505ba9fc25745268ff7b839c7989851c71b
font_01_sfnt_off0000f848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF848 10912 bytes
SHA-256: bb4320f371ea6b8335777c6137ae3fbc32d12d9504f5c2839516c576ac3739fd

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