Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d09499e05daef57…

MALICIOUS

PDF

76.5 KB Created: 2021-04-24 06:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a8e9653ab100cb621db62f62f380b52b SHA-1: dd7e01f8c79910005513cf16e8cbd6374c27b21e SHA-256: 6d09499e05daef57f81f48e5d7c4a45a8238595db352fcf25943b51cea6444d2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on low-reputation hosting, likely to redirect users to malicious sites. The presence of external URIs and the overall structure suggest this PDF is designed to trick users into visiting a compromised or malicious website.

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://zajinet.ru/strik?utm_term=my+car+ac+is+not+working+properly PDF link annotation
    • http://pemegira.22web.org/rugunolubu.pdfIn PDF document text
    • https://fumuradowije.weebly.com/uploads/1/3/0/7/130739974/nuguvovojote.pdfIn PDF document text
    • http://nagesebaz.iblogger.org/ximutura.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379240/normal_605a240280c30.pdfIn PDF document text
    • http://xelamoxadavas.mywebcommunity.org/47873715463.pdfIn PDF document text
    • https://luwozupewudaxu.weebly.com/uploads/1/3/1/3/131384663/5492760.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471234/normal_603b9eb18eeb9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zexitifi.rf.gd/karl_marx_sociology_theory.pdfIn PDF document text
    • http://pofisijakot.epizy.com/barron_s_new_sat_28th_edition_download_free.pdfIn PDF document text
    • http://jawuguv.epizy.com/75_common_interview_questions_and_answers.pdfIn PDF document text
    • http://gejizejaniwijef.atwebpages.com/47645261621.pdfIn PDF document text
    • http://vujexufekazama.rf.gd/characteristics_of_epic_hero.pdfIn PDF document text
    • http://suruliloxapesas.myartsonline.com/edible_packaging_materials.pdfIn PDF document text
    • http://xelelurez.rf.gd/how_much_is_amazon_prime_video_on_ps4.pdfIn PDF document text
    • http://xologikaju.atwebpages.com/french_bilingual_dictionary.pdfIn PDF document text
    • http://fozozip.onlinewebshop.net/vowijegugofubigowavox.pdfIn PDF document text
    • http://dixitexajujus.epizy.com/vuxedudirupodaxavepesap.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_off0000ec1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1C 5364 bytes
SHA-256: ead2fda74997e170d1fc4a8f2231a8033b25e94d66c8596d66be894d9dcf6ff9
font_01_sfnt_off0000fe97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE97 10908 bytes
SHA-256: 7055e9e6c822d47ef7c4287edb911cfa0c2d56be5d2bb0de5445206fc2129f2d

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