Malicious PDF — malware analysis report

Static analysis result for SHA-256 a169916ccfa7b21b…

MALICIOUS

PDF

92.2 KB Created: 2021-03-05 14:17:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 82047ae1ba25337b15e9e5d2347b2dcb SHA-1: abf6097ebab1650870ee4552582a7fcaf703d7d2 SHA-256: a169916ccfa7b21b9f805076b64b226c88fb9ec5f6921d7182e180c1592c98ef
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged by ClamAV as Pdf.Phishing.Trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using disposable hosting for link farms, suggesting a malicious intent to distribute further payloads or conduct phishing. Although no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://soxebez.ru/award?keyword=how+do+you+fix+the+timing+on+an+old+singer+sewing+machine PDF link annotation
    • http://lady-bug.club/how_to_watch_streams_on_youtubecevi1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475987/normal_5fd102467dec4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368996/normal_5fe3c06adc7fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465269/normal_6037a6f98dc70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445325/normal_5feed2952333a.pdfIn PDF document text
    • http://netopodimamo.mywebcommunity.org/develesuf.pdfIn PDF document text
    • http://moradudipomibo.mypressonline.com/93641740335.pdfIn PDF document text
    • http://luchdobro.site/ray_dalio_principles275k6.pdfIn PDF document text
    • http://pristav.pro/best_telehealth_stocks_to_buy_nowpl1xy.pdfIn PDF document text
    • http://profapp.pro/fipidunuxiwezawozesge43q.pdfIn PDF document text
    • http://carbackseat.site/descargar_appvn_apk_ios1pr2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369774/normal_5ff4756d37068.pdfIn PDF document text
    • http://remontlegko.info/basopelejulemug0ofij.pdfIn PDF document text
    • http://mandarins.space/commercial_invoice_template_euroe2nt9.pdfIn PDF document text
    • http://dusanaputojinon.mygamesonline.org/still_alice_full_movie_download.pdfIn PDF document text
    • http://parkji5x.xyz/coso_framework_for_internal_and_financial_controlsa06u4.pdfIn PDF document text
    • http://rumurel.mywebcommunity.org/51523841751.pdfIn PDF document text
    • http://ninuxalezopo.getenjoyment.net/titofajuduse.pdfIn PDF document text
    • http://stroiline74.ru/863543108980lf7f.pdfIn PDF document text
    • http://firstreadersclub.com/android_close_app_in_backgroundvtjek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_915e3e42b9724487b761d394bc0c985f.pdf?index=trueIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_f68c32e750d54f33b78433967f334d2e.pdf?index=trueIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_98716b389ea444619db9bd294c127bac.pdf?index=trueIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_08d4de5419fc40f5a2efb6dcec99b1d4.pdf?index=trueIn 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_off00012b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B80 5656 bytes
SHA-256: 2aab11ca7aced027b33b84b6c0fcc1a33da23f176138e8a3c9607dde855071d8
font_01_sfnt_off00013eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAF 10476 bytes
SHA-256: e9051ad639c9e2152e42cc95820a36b9b2d0c25b49c6b36fcff747cc5633ea68

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