Malicious PDF — malware analysis report

Static analysis result for SHA-256 5498fdeebc71d01b…

MALICIOUS

PDF

84.1 KB Created: 2021-03-01 04:29:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f1cdb3d1d43614bf49dac46bfad38cd3 SHA-1: 5ba52bbe1dfcae4d29803f5ce0fa6569735bac90 SHA-256: 5498fdeebc71d01b0c7894c74b9edc1b037af955f66931603f0521d1a17eea2b
126 Risk Score

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 high likelihood of this document being used to distribute malicious links or content. No scripts were extracted, but the presence of many external URIs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=what+did+we+learn+from+the+bobo+doll+experiment PDF link annotation
    • http://innov-cis.net/kuzaf6ou87.pdfIn PDF document text
    • http://znakomstva69.space/dunonezomupupesuwosemoyeadu.pdfIn PDF document text
    • http://wrinklestiltskin.com/demostrar_identidades_trigonometricas_ejercicios_resueltos923i7.pdfIn PDF document text
    • http://microbladingcertificationdfw.org/tifuboi38vq.pdfIn PDF document text
    • http://shtancircul.site/motorola_sb5100_modem_ip_address4jhjs.pdfIn PDF document text
    • http://cenderaoriginator.com/19783713373rogc5.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/gg8Itgg/ted_baker_coat_review.pdfIn PDF document text
    • http://zootime.store/listen_monster_in_paris_lyricsz5u4w.pdfIn PDF document text
    • http://weraka.online/pikowusidikabusazaridomzpgb.pdfIn PDF document text
    • http://baltika-trans.com/39538596591z5vmt.pdfIn PDF document text
    • https://cdn.sqhk.co/rojozedofaf/Sijdiej/47138285687.pdfIn PDF document text
    • http://astrohelp.space/zowixelokop7nssn.pdfIn PDF document text
    • https://cdn.sqhk.co/maxanogefo/PBiXkhd/38834886768.pdfIn PDF document text
    • http://oneitstore.pro/vaboduluwisuxl0ijr.pdfIn PDF document text
    • http://1xbet-registr.site/du_battery_saver_2017_app8epsf.pdfIn PDF document text
    • https://cdn.sqhk.co/xadeviro/hiNlNhe/stickman_army_the_resistance_game.pdfIn PDF document text
    • http://bestita.space/botanicula_full_androidwswgf.pdfIn PDF document text
    • http://pixell.store/52772938217aiiqn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nisexugolozefa.rf.gd/53083773535.pdfIn PDF document text
    • http://wuwepapose.epizy.com/64831356060.pdfIn PDF document text
    • http://kamegil.epizy.com/71956406988.pdfIn PDF document text
    • http://xibogowidam.epizy.com/35948346743.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_off00010ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA1 5416 bytes
SHA-256: 2cdfb1d6ff620b01e94482c62d2b1f78fe37701dd5bbb6d33b07187da61d3746
font_01_sfnt_off00011df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF7 10876 bytes
SHA-256: 4a683c97b2a7def613bbb34939d48cf0e4b0f65b77396d1e789eb2983c5909c0

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