Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dedc73567473e13…

MALICIOUS

PDF

73.9 KB Created: 2021-05-15 15:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4692efdcb6e7f4bca503a41c279347da SHA-1: 18b9f97d5faab97ff958e4f77805be04454e3bc7 SHA-256: 8dedc73567473e1397da78b5051027d2e0e6c285d6b741a25dcea38657aa94c6
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 embedded URLs, many of which point to disposable domains and are likely used to host malicious content or redirect users to phishing sites. The document body, though partially corrupted, suggests a lure related to 'Animal Farm' questions, indicating a social engineering tactic to entice users to click on the malicious links.

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://pelibifir.ru/strik?utm_term=animal+farm+chapter+1-3+questions+and+answers PDF link annotation
    • http://evatopshop.xyz/bipunirujafudiluzaxusoladu29t5.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/english_grammar_class_onliner59g9.pdfIn PDF document text
    • http://alifan.store/66439046875fmk2e.pdfIn PDF document text
    • https://guvopizap.weebly.com/uploads/1/3/0/7/130776702/givamidilenipanuxat.pdfIn PDF document text
    • http://normal-id.com/lejixogodijekolemavh3gxk.pdfIn PDF document text
    • http://tonevagewalilu.medianewsonline.com/pijuwaf.pdfIn PDF document text
    • http://gufutaca5.xyz/malibugesaridubatuxufekb9ev.pdfIn PDF document text
    • http://kismykeitio.best/xevix9wcgk.pdfIn PDF document text
    • http://i-men.ru/pagujov28pqb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469623/normal_606e3bf521e5a.pdfIn PDF document text
    • https://duvutotan.weebly.com/uploads/1/3/0/7/130775700/rededoz_jujoxejog.pdfIn PDF document text
    • http://flowerport.shop/28285836082yc9yb.pdfIn PDF document text
    • http://vizit.store/arabic_to_english_dictionary_app_for_androidauov3.pdfIn PDF document text
    • http://lonemap.medianewsonline.com/ocr_a_level_biology_textbook_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379483/normal_5ff0edea5cc32.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pusixa/how_to_add_and_subtract_fractions_with_different_denominators_and_whole_numbers.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/banner_template_design.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/circumference_of_a_circle_worksheet_grade_4.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/65852505807.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/heating_curve_calculations_worksheet_answer_key.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_off0000dfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDD 5848 bytes
SHA-256: f186492831485690810e958da7f13c4ef6a0a42b55b3f94d66d48c26d2865ebf
font_01_sfnt_off0000f3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B6 10828 bytes
SHA-256: cba4bc37d9521dac17a7d7cd521fd38d213655e041a48a4c8ab6bc7d46a2fa20

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