Malicious PDF — malware analysis report

Static analysis result for SHA-256 88882d8f9c20bab2…

MALICIOUS

PDF

135.5 KB Created: 2021-04-20 15:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: c19a75dd86d5953aee2934f7a4ef14da SHA-1: 240d38043d652e8c3715e88212752e0c12ae5640 SHA-256: 88882d8f9c20bab2efe6269d3fe23972b2d29f2b06ce75fb5030eaf3a53115d5
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, further supporting this. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF format suggest potential for JavaScript execution to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://fokemale.ru/strik?utm_term=chapter+5+test+form+a+india%2527s+first+empires PDF link annotation
    • http://muruxilirafet.iblogger.org/92508815217.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/ihevdyX/23544030212.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/gbtiajg/crosswords_with_friends_11_29_20.pdfIn PDF document text
    • https://susutabum.weebly.com/uploads/1/3/4/4/134464128/melelifomab.pdfIn PDF document text
    • https://cdn.sqhk.co/bilexodofose/9znggji/gumotaburibak.pdfIn PDF document text
    • https://zujomesesewega.weebly.com/uploads/1/3/4/9/134902804/sorukaxofijibum_zizaver_gadimisiminulu.pdfIn PDF document text
    • http://muvibigi.22web.org/28888358240.pdfIn PDF document text
    • https://pidujalibogi.weebly.com/uploads/1/3/1/3/131380128/3245814.pdfIn PDF document text
    • https://cdn.sqhk.co/wanevakaxuma/5gcPujb/sipipirujolivol.pdfIn PDF document text
    • https://cdn.sqhk.co/basinasedu/5hejgij/games_to_learn_english_for_adults.pdfIn PDF document text
    • https://lapokatodulobak.weebly.com/uploads/1/3/5/3/135347459/vevigikes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jojofolarimema.epizy.com/91809401385.pdfIn PDF document text
    • http://tozibuxadotoba.epizy.com/walter_riso_libros_la_afectividad_masculina.pdfIn PDF document text
    • http://roxonolabixatox.epizy.com/xisabas.pdfIn PDF document text
    • http://fetavuxoze.epizy.com/northampton_integrative_medicine_reviews.pdfIn PDF document text
    • http://kuwixogup.rf.gd/84649444161.pdfIn PDF document text
    • http://wadokeg.epizy.com/atlas_of_minerals_in_thin_section.pdfIn PDF document text
    • http://vefagukolile.epizy.com/sakedoka.pdfIn PDF document text
    • http://bixodog.rf.gd/51112011480.pdfIn PDF document text
    • http://lovagijikem.epizy.com/rugilekavumebededivosuba.pdfIn PDF document text
    • http://gobonelore.epizy.com/xoxoxetitobalu.pdfIn PDF document text
    • http://jirunogi.rf.gd/sample_appraisee_comments_for_performance_appraisals.pdfIn PDF document text
    • http://tafaredos.rf.gd/jezeva.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C736 5220 bytes
SHA-256: cec36fa7c1bd4f44aca9e96e32851f363785250e825835aa67ad4bf6fb07b71c
font_01_sfnt_off0001d8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D8DB 11472 bytes
SHA-256: 92047432d6d3cdb596d25e04574c5a295c241376d3ecaee2a70e0ad4df4fe5cc
font_02_sfnt_off0001ffe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FFE7 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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