Malicious PDF — malware analysis report

Static analysis result for SHA-256 a918ada8f5404674…

MALICIOUS

PDF

99.4 KB Created: 2021-03-20 15:23:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: eadc291a9b988d427bc3bae16984d1ec SHA-1: b36b454bd288bcd2d1053432e110b51372ba03d7 SHA-256: a918ada8f540467465de2d30e1f7774d5943c15baec3c0164e189861c2a74eff
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 0.9995

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://crophysi.ru/aws?utm_term=what+a+scrum+master+does+not+do PDF link annotation
    • https://cdn.sqhk.co/nuvexajamu/aidpgc4/my_little_pocket_pony.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384484/normal_60174001956ee.pdfIn PDF document text
    • http://sozaxesugoj.mywebcommunity.org/conversational_english_online_jobs.pdfIn PDF document text
    • https://busejutepegojo.weebly.com/uploads/1/3/4/7/134773147/fab3365f.pdfIn PDF document text
    • https://wotipivas.weebly.com/uploads/1/3/1/4/131482993/sexegi-wimiwan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413113/normal_6029c4424645e.pdfIn PDF document text
    • https://cdn.sqhk.co/pibavasedegi/lrhigis/ncaa_d2_soccer_championship_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/xipitufekaru/Xjbjeje/24251411972.pdfIn PDF document text
    • https://zunurevupuvofas.weebly.com/uploads/1/3/1/4/131438471/3f056f348ba28fb.pdfIn PDF document text
    • https://fularoxu.weebly.com/uploads/1/3/1/4/131452806/8c8e6.pdfIn PDF document text
    • https://cdn.sqhk.co/logubaxe/ghhgjiP/hcp_portal_quest_diagnostics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406463/normal_5fd7d12f695f5.pdfIn PDF document text
    • http://rokuboxajiga.medianewsonline.com/optimal_binary_search_tree_algorithm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376619/normal_5fd7b1870aaf9.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/be054637-63de-4a1e-843f-e1e00878389c/naming_ionic_compounds_worksheet_answers_chem_worksheet_8-2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dda5c9c8-828b-49dd-9699-32ce3e81fd28/sql_black_book_download.pdfIn PDF document text
    • http://defakulid.atwebpages.com/capitals_of_different_countries.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e3c8839-d459-4763-961d-75035bb1a06b/verb_practice_worksheets_high_school.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F33 6864 bytes
SHA-256: 6d2f47a29affd873a68af198d01e97743ce139da2104d1a3c55c92241db31638
font_01_sfnt_off0001308c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308C 5160 bytes
SHA-256: ec19dacdd29eeeb2895e53ed55a91cbac27a0218e55635254cf9420242be2842
font_02_sfnt_off000141ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141EA 7880 bytes
SHA-256: 33d8f0a907f0e191c5c393748279a33479d353c3674c56471fef62265d14d5c9
font_03_sfnt_off0001591a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1591A 11476 bytes
SHA-256: e44fd07411569124fee0905c046b8e22418afe17861f300294656d62a41d2e20

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