Malicious PDF — malware analysis report

Static analysis result for SHA-256 336a966adb0dc691…

MALICIOUS

PDF

95.0 KB Created: 2021-03-24 20:30:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 953c7a961514d7fa27c53af1f2eca712 SHA-1: 4364ed717707c692b41c821de0bec929c9b8c183 SHA-256: 336a966adb0dc6911dc4ae0aff2cc133cd4a07ddd891005781126fd1b9266c43
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document exhibits malicious behavior by attempting to lure the user into disabling security software and installing a browser extension or update. The embedded URLs, such as https://xezojetit.ru/123?utm_term=pneumatic+system+maintenance+pdf, likely serve as part of this social engineering scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/123?utm_term=pneumatic+system+maintenance+pdf PDF link annotation
    • http://dipazekonowa.mypressonline.com/ccna_routing_and_switching_complete_study_guide_free.pdfIn PDF document text
    • http://tigafik.mygamesonline.org/75248325245.pdfIn PDF document text
    • http://xiwesesakuvel.medianewsonline.com/exercicios_barroco_e_arcadismo.pdfIn PDF document text
    • http://pemizirevubel.mywebcommunity.org/xobuzidegimitozunugedepa.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/how_to_become_a_forensic_handwriting_expert.pdfIn PDF document text
    • http://kotudekudoges.getenjoyment.net/how_do_i_convert_kindle_to_on_mac.pdfIn PDF document text
    • http://jepisafidezegun.scienceontheweb.net/beluwixike.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liwetagosozel.onlinewebshop.net/wavavale.pdfIn PDF document text
    • http://bavevex.onlinewebshop.net/detailed_lesson_plan_in_math_grade_11.pdfIn PDF document text
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_c873e63379ac434eace82e1835ac46f3.pdf?index=trueIn PDF document text
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_0a353d7173cd4e49bdcab68f8b9bf904.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ff389d8-e3e6-4a59-a9e9-07bad9b98f2d/93676319377.pdfIn PDF document text
    • http://juludiripo.myartsonline.com/87270170017.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/91551912992.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/gomalirukebefipuduxuf.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/xulutewepepo.pdfIn PDF document text
    • https://c69a8150-bb1e-4c46-878b-fc1622391bd7.filesusr.com/ugd/cf91d6_fda30a8f3f8d4a66be2aad25bd47740e.pdf?index=trueIn PDF document text
    • https://e4dd5bf8-bd13-43e3-b37b-9624b2564f03.filesusr.com/ugd/093416_93d4153cf89e4dfa926f46c50f9ab367.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/what_if_god_was_one_of_us_lyrics_chords.pdfIn PDF document text
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_415f6cc5e2c048849e34f86df9237a68.pdf?index=trueIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_f9e0e3bb3653449a9080ac5edfb76161.pdf?index=trueIn PDF document text
    • https://56352102-112a-4456-a677-0775450c4ed3.filesusr.com/ugd/ed4e87_282e962f82c642aab81a7ff30cfe6655.pdf?index=trueIn PDF document text
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_81ab675eae964cb28c196656269317ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b3dee9c-5edd-4c97-92a7-ee70931af003/lafuwi.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_off00013480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13480 5276 bytes
SHA-256: 9be17d31719e8581c5a75c78bb101734593c3e44492a0e00bdf1f2b6da5afef8
font_01_sfnt_off0001466e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1466E 11260 bytes
SHA-256: 0e6225d80182c82cdd8b64e8a73694c5b043d52b5452d60dcbca05158e3f9d6c

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