Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1788818c2d28e2…

MALICIOUS

PDF

80.0 KB Created: 2021-03-02 12:41:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f365ac77ec110fab16597a07cfbc9dca SHA-1: d7e8967322bddf2f149194f2cfc560136eb99c6d SHA-256: 4a1788818c2d28e2523c0bc3cf1e097b8780450bed7685a75dd999c320ebb788
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'Ap calculus multiple choice questions', aiming to trick users into clicking the embedded malicious links.

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
  • 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://midufefew.ru/123?utm_term=ap+calculus+multiple+choice+questions+by+topic PDF link annotation
    • http://fibaxoxadomi.sportsontheweb.net/voxomowa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425487/normal_6005f85f060fb.pdfIn PDF document text
    • https://buxodofuluni.weebly.com/uploads/1/3/4/8/134875319/jolisepulipuleg-wofanid.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/what_is_the_flat_rate_for_international_shipping.pdfIn PDF document text
    • https://lizoduloto.weebly.com/uploads/1/3/4/7/134701777/gijegebe-jekijoxunebo-bilumave.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/the_power_of_doing_less_download_free.pdfIn PDF document text
    • https://zivexuxa.weebly.com/uploads/1/3/1/8/131871677/lemulejut_newobe_zelovitex.pdfIn PDF document text
    • http://profer-opt.ru/sibarabafukufexolebasasic6btj.pdfIn PDF document text
    • https://piwomokoxik.weebly.com/uploads/1/3/5/3/135335333/8249484.pdfIn PDF document text
    • http://laitlabs.pro/alan_watts_death_is_an_illusion9kdgg.pdfIn PDF document text
    • http://pet-guru.shop/zalapiigfxz.pdfIn PDF document text
    • http://bafiselavanebep.mywebcommunity.org/data_structures_and_abstractions_with_java_4th_edition_solutions.pdfIn PDF document text
    • http://tevaruv.sportsontheweb.net/how_to_get_a_international_driving_permit_for_japan.pdfIn PDF document text
    • http://xojuxegalixiluj.66ghz.com/connected_mathematics_grade_7.pdfIn PDF document text
    • http://4kuhd.me/chi_sun_college_roomjkhia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gipebevu.atwebpages.com/how_do_you_critically_analyse_a_journal_article.pdfIn PDF document text
    • http://jibapasugaxelo.epizy.com/city_of_regina_leisure_guide_login.pdfIn PDF document text
    • http://dasobiviwadodaj.atwebpages.com/72952225192.pdfIn PDF document text
    • http://jududupozibuj.rf.gd/pexibimipofigolevow.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_off0000fc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC28 5436 bytes
SHA-256: fc5eb6bb8a169d387d1dee3626fb74ed1cfda79175a9fa55636d9587d3ab9285
font_01_sfnt_off00010e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8C 10668 bytes
SHA-256: 54d1d67e3a15b394d59325fcbc1551867b31e30d877a578b615b85be09607eb7

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