Malicious PDF — malware analysis report

Static analysis result for SHA-256 0da8d7218a7f751c…

MALICIOUS

PDF

81.2 KB Created: 2021-03-16 21:00:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dddce95ee097a3ef84c42fd9349f905c SHA-1: 8ea1b23c79fdbecc1baebee99d70f267425520bc SHA-256: 0da8d7218a7f751cf1c909e67358b2b824bef6512a046f992840ee3b86b7b227
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 0.9997

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://mezovuduw.ru/wix?keyword=nature%2527s+answer+norwegian+cod+liver+oil PDF link annotation
    • http://whysmall.space/879942047449w7iu.pdfIn PDF document text
    • http://registrat.space/what_is_customer_acquisition_process0aqhm.pdfIn PDF document text
    • http://vugaganopofom.mypressonline.com/98037440629.pdfIn PDF document text
    • http://paksorond.xyz/free_ged_practice_test_2021nein5.pdfIn PDF document text
    • https://cdn.sqhk.co/nimuxugemu/0gjig9z/belowu.pdfIn PDF document text
    • http://fepigubigi.iblogger.org/bivaxebofukukazariru.pdfIn PDF document text
    • http://idem-peshkom.ru/pixesoworikimokokosiwyrgsd.pdfIn PDF document text
    • http://toxipoxekej.medianewsonline.com/mckesson_employees_federal_credit_union_phone_number.pdfIn PDF document text
    • http://rimka.xyz/gebusegefy0ykl.pdfIn PDF document text
    • http://sazaleve.22web.org/dibuka.pdfIn PDF document text
    • https://cdn.sqhk.co/jevipugirofi/gdzT5jf/sulaxiladisidakadilosibe.pdfIn PDF document text
    • http://heliusdesign.ru/ignou_tentative_date_sheet_2018i1d8s.pdfIn PDF document text
    • http://wonozudobitisog.scienceontheweb.net/why_to_write_an_article.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/ySjeKif/crash_test_dummies_mmm_gif.pdfIn PDF document text
    • https://cdn.sqhk.co/bedazume/TK0TjiG/18119753111.pdfIn PDF document text
    • http://lumolowopixu.iblogger.org/91115136331.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sagoralezerelo.onlinewebshop.net/prefix_and_suffix_worksheets_high_school.pdfIn PDF document text
    • http://rusireges.epizy.com/36668592085.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d245d57-9645-432c-9bce-7c7ea1252d90/dovivepe.pdfIn PDF document text
    • http://nuzikenevizut.onlinewebshop.net/dokemix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db999f24-af83-40c8-86fc-1439f7c2e257/what_is_the_average_salary_of_a_process_engineer.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_off0000f938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 5264 bytes
SHA-256: 5f868b4fc702e389d5a5505f444b56f78c3e657c0c9dd9b5a1db661254a4dc2b
font_01_sfnt_off00010b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4E 12920 bytes
SHA-256: 6bf698c918640f30b1980601852447b582f685af10242e14b66bfc99948f5857

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