Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e19643179cbc13…

MALICIOUS

PDF

76.1 KB Created: 2021-03-20 17:17:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8d27767d391729d30665c053c598ef13 SHA-1: a80ae242cb9646985aaeb6a14b19e84272582d58 SHA-256: 41e19643179cbc13e0bacff2adb9bed5f6c3d64cc77f4a35dfbc59a7d2ef9a41
166 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 flagged as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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/award?keyword=caligrafia+vocales+para+imprimir+pdf PDF link annotation
    • http://sexesex.site/how_to_forgive_a_persongsw6h.pdfIn PDF document text
    • http://rubeatyshop.xyz/84779084406kp3lc.pdfIn PDF document text
    • http://vekvelo.ru/savudutexuj5erz.pdfIn PDF document text
    • http://fonivoguko.medianewsonline.com/furototize.pdfIn PDF document text
    • https://xevefozivoro.weebly.com/uploads/1/3/5/3/135339272/jofewajuwamafupikif.pdfIn PDF document text
    • http://tb-films.ru/podenm8ult.pdfIn PDF document text
    • https://cdn.sqhk.co/zudatona/ghcghgg/14245240592.pdfIn PDF document text
    • http://douchehq.xyz/97437082395p4rgk.pdfIn PDF document text
    • http://clebohets.xyz/kadepigejiwanifekunapudokdlpiq.pdfIn PDF document text
    • http://chambreop.xyz/88094900033n8cxk.pdfIn PDF document text
    • https://xipumizi.weebly.com/uploads/1/3/4/7/134746986/b0e8926f41976.pdfIn PDF document text
    • http://volulolusawaz.mygamesonline.org/66167027061.pdfIn PDF document text
    • https://midamexup.weebly.com/uploads/1/3/5/3/135314938/0d9a1a4a.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/ketidedase.pdfIn PDF document text
    • http://sizegoduxuxa.mygamesonline.org/simewamowolisijijogikivov.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/jhphapb/9104735634.pdfIn PDF document text
    • http://svarka-aurora.online/2008_ford_escape_3.0_oil_changex8uls.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/834cf8b1-6653-44bd-9c92-f31621cdb69c/3_day_potty_training_method.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da5933db-c456-41dc-b9ad-6d6e71c56e12/72714968120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0c4eb48-055f-4e19-93b1-f17250faad36/bumoxoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eb00bd9-6b31-46f3-882f-fd311b631080/phonics_assessment_for_2nd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7244515-8e79-41d0-ab73-45e5aa251dab/jasopet.pdfIn PDF document text
    • http://xabudavadeguvo.myartsonline.com/xuzaburudadorul.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_off0000e853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE853 5440 bytes
SHA-256: e8b0fade8f512fc7c680bf4840b3076eafec459610eefd7d8fc26a1eaf7a8747
font_01_sfnt_off0000fac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC5 11988 bytes
SHA-256: 8d1ffb33c70784276831ed577f06c3a666c4fdf18793e9afedc15165f8770a38

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