Malicious PDF — malware analysis report

Static analysis result for SHA-256 056e96ce55d2a8a0…

MALICIOUS

PDF

78.2 KB Created: 2021-03-20 20:44:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: ca7dcfb2582cbb6cdb5f08a27ef94302 SHA-1: 9495fea85b940da3487f1b6a09cb598abacb9814 SHA-256: 056e96ce55d2a8a026e93852ba9b644992b8755459c6b638eb17f124eb25a158
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or redirection infrastructure. The document body, though heavily obfuscated, appears to be a lure related to 'cell analogy worksheet pdf answer key', aiming to trick users into clicking 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://botokaw.ru/award?keyword=cell+analogy+worksheet+pdf+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365627/normal_6035183f02e5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369911/normal_604220d491f2a.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/cannot_open_printing_preferences.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458838/normal_5fe77999e0e8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450883/normal_5ff447667f163.pdfIn PDF document text
    • http://dupuladusudired.mypressonline.com/what_is_the_best_50_gallon_gas_water_heater.pdfIn PDF document text
    • http://tulusujubige.mygamesonline.org/56069102341.pdfIn PDF document text
    • http://zotikarida.medianewsonline.com/bukiverorejetopa.pdfIn PDF document text
    • http://terugate.mypressonline.com/sefejegixodejafadujuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wosezime.epizy.com/33322603843.pdfIn PDF document text
    • http://zobawukesilebaf.epizy.com/94076529030.pdfIn PDF document text
    • http://venasirurupa.rf.gd/kepisolemotuvuval.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fbae064-cde9-481c-8af7-efef98078a2f/how_long_does_it_take_to_issue_a_letter_of_credit.pdfIn PDF document text
    • http://xokawetuvon.epizy.com/ccna_2_chapter_6_exam_answers_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/151e0707-a05c-4594-b6dd-b2ee2b9c84a1/27119984459.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce7b83eb-d48f-4077-8f23-1630da003cd4/how_to_reset_check_engine_light_nissan_sentra.pdfIn PDF document text
    • http://wuzuferopo.epizy.com/website_templates_slideshow_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22100961-cfd8-43da-a8cf-683fca2b5ebc/xezowerufidirolososedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7b6a98f-e09a-44a2-9ed1-5035a8c1c80c/tesofedasukafepawipuko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6f963ba-1f4c-4cbd-bb61-1a66085f9ce7/international_journal_of_medical_microbiology_and_tropical_diseases_impact_factor.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_off0000ede6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 5464 bytes
SHA-256: c52b900e5e349ada5a58661c7ac8ab3543b29ea01dc75c4918a5d861d0f5bb5d
font_01_sfnt_off00010091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10091 13024 bytes
SHA-256: 2785545d33e6d8bd5d256d9d1917f32fe26bdd0d34ea14886baeac2ab69666c7

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