Malicious PDF — malware analysis report

Static analysis result for SHA-256 de135e9e348c529a…

MALICIOUS

PDF

79.7 KB Created: 2021-04-23 13:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 3cb2e26f518333205f70693056a6d5ff SHA-1: f7d9d72b251f6e1da32f27a1b0c6a7a9c1e21a03 SHA-256: de135e9e348c529a679dbdc53889b031b6bd5ddaabeea5e5de66e1fdf83fc09e
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 deliberate attempt to create a large number of links on low-reputation hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the primary attack vector appears to be the embedded links leading to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/strik?utm_term=go+ask+alice+lyrics+jefferson+airplane PDF link annotation
    • http://universityru.fun/mini_teclado_inalambrico_bluetooth_android_windows_mac3xa6g.pdfIn PDF document text
    • http://soldonlittleton.com/what_is_electrical_engineering_technology_aas21twi.pdfIn PDF document text
    • http://xesapuwax.mywebcommunity.org/google_classroom_tutorial_for_teachers_2020.pdfIn PDF document text
    • http://sfhgfje5df.xyz/vidya_ganapathi_stotram_in_telugumi5ye.pdfIn PDF document text
    • http://natikolom.site/kotevu1r1eg.pdfIn PDF document text
    • http://vevapefin.sportsontheweb.net/56332199966.pdfIn PDF document text
    • https://savaxibinis.weebly.com/uploads/1/3/3/9/133997587/bosodoxe.pdfIn PDF document text
    • http://topcreditmonitoring.info/berizodinarexadasezesarepjqfb.pdfIn PDF document text
    • http://reduslim-shopofficial.site/sojerumuzoxojozyk3zj.pdfIn PDF document text
    • https://moxalabukeziro.weebly.com/uploads/1/3/4/7/134772199/1107830.pdfIn PDF document text
    • http://usejus.pro/337691869870bify.pdfIn PDF document text
    • http://subbellassecret.com/sample_essay_for_college_scholarship7m415.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://33da92c3-26de-4f6b-bf12-1693cb6a6e79.filesusr.com/ugd/0307f2_63b65be5a2064aa893de70a8a17d453b.pdf?index=trueIn PDF document text
    • http://desovizipelo.onlinewebshop.net/43705157405.pdfIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_83269b2f954045a0aa2c4e08f6d38099.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/03c9d8e5-24a3-4366-9f1d-adf27042cac6/examples_of_descriptive_and_inferential_statistics.pdfIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/lords_of_chaos_streaming_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5772f4c-a5b5-430b-937f-db4a4c236e0b/lidoxik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e9036d3-08e2-4d90-97de-cd48e1a1bcad/84072570482.pdfIn PDF document text
    • http://xabudavadeguvo.myartsonline.com/47064775405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0be0c6b1-2fa8-49d9-aeaf-b97013c45c11/86324354808.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_off0000f9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CC 5284 bytes
SHA-256: d6577ecacbe734f1f21af47401bba85697331f975d55524d50c00c42579f014d
font_01_sfnt_off00010bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BED 11012 bytes
SHA-256: c2552f8ceb79b821d6bba0ce6d9cdf579ade5e6f38dd8af88d3762eb8b33023f

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