Malicious PDF — malware analysis report

Static analysis result for SHA-256 744354788ac93bb2…

MALICIOUS

PDF

94.1 KB Created: 2021-03-16 13:41:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0443c7c7a0f267c8c3bf58a140d56c31 SHA-1: b8cf9bb9fa4ef5f8720ffaa91186bb67f5910f47 SHA-256: 744354788ac93bb21bd3e125514bd21799bb50fd235277d9fcbd1fad9093e599
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm characteristics indicates an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/wix?keyword=behaviorism+and+social+learning+theory+quizlet PDF link annotation
    • http://tusapet.iblogger.org/whatsapp_latest_for_nokia_c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371806/normal_602f49d4f0498.pdfIn PDF document text
    • http://ibkreactiva2020.com/what_to_say_when_someone_says_guess_whatk711n.pdfIn PDF document text
    • http://labiluwewinedu.22web.org/captivate_8._0.pdfIn PDF document text
    • http://securespot.ru/how_to_make_cold_froth_nespressopud83.pdfIn PDF document text
    • http://50offstore.info/dibevopipotivevezufibumuycc9n.pdfIn PDF document text
    • http://buzajusefuzasi.22web.org/53428898547.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459466/normal_602eb460a3c18.pdfIn PDF document text
    • http://nizupafexebofak.iblogger.org/android_google_analytics_integration.pdfIn PDF document text
    • http://wordwild-store.com/audio_amplifier_circuit_diagram_using_transistor35ws3.pdfIn PDF document text
    • http://elerctum.org/bessie_head_the_collector_of_treasures_text4d7cv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390056/normal_60355ad6de5d6.pdfIn PDF document text
    • http://bu-markett.com/604095523867dyev.pdfIn PDF document text
    • http://leyloften.online/nora_roberts_series_books_in_orderx5wm7.pdfIn PDF document text
    • http://mekozeka.66ghz.com/36645750516.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366375/normal_5fff6cf70238c.pdfIn PDF document text
    • http://power-guard.shop/naruto_databook_4a8459.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/xedewofuretujo/workout_plan_to_get_ripped.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/faxijesujejanewofe.pdfIn PDF document text
    • http://legumanob.rf.gd/porulovela.pdfIn PDF document text
    • http://davutawopoban.epizy.com/30022948430.pdfIn PDF document text
    • http://kexijilavagela.rf.gd/fuxafumojedafulatum.pdfIn PDF document text
    • http://kegipufi.rf.gd/motu_aur_patlu_ki_jodi_cartoon.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_off00013041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13041 5740 bytes
SHA-256: 4c87553ad66ef38825499d3c5823684d68dec6f17550523b13184d62a03156a8
font_01_sfnt_off000143aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143AA 11680 bytes
SHA-256: 0bec966185ae64fa3c1d782ccca3dee00096b32022c46b2d1c5bab3da153e1e3

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