Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ec7e6ff6db7007…

MALICIOUS

PDF

76.0 KB Created: 2021-06-09 08:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: af2b6c4cc2f294406c682618fddbfc70 SHA-1: ee461b2fb71d9fe0545270b124d283ccc0e22215 SHA-256: 11ec7e6ff6db700792a8cfe53e01205ca6dc0f2c07a2a4da4b3c077762eb5859
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The primary malicious URL is https://oniceh.ru/pbw?utm_term=static+electricity+of+scotch+tape+lab+answers, which likely serves as a lure for phishing or malware distribution. ClamAV detection and ML classification further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://oniceh.ru/pbw?utm_term=static+electricity+of+scotch+tape+lab+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375076/normal_606df378eb30e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378381/normal_5ff3659d49627.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368246/normal_605d83b26fa90.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruwezebom.pbworks.com/f/murderers_among_us_the_simon_wiesenthal_story_download.pdfIn PDF document text
    • http://domewisisu.pbworks.com/w/file/fetch/144813342/zazopusofimozesi.pdfIn PDF document text
    • http://sipibujewadu.pbworks.com/w/file/fetch/144577107/actividades_de_tercer_grado_de_primaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a9d7425-a4b7-4a83-8311-8ea910888316/delta_37-190_jointer_review.pdfIn PDF document text
    • http://fagimox.pbworks.com/w/file/fetch/144600945/cinderella_and_four_knights_ep_9_eng_sub_facebook.pdfIn PDF document text
    • http://rupebaxo.pbworks.com/f/77244641666.pdfIn PDF document text
    • http://gedelageke.pbworks.com/f/lisewidikixu.pdfIn PDF document text
    • http://gitefov.pbworks.com/w/file/fetch/144466794/system_requirements_for_adobe_premiere_pro_cc_2015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/633069fe-2ef7-4c1d-8e50-850c07a50ae7/26084170838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fed29af0-b4e5-4b52-966d-4bdb7361502f/jagamedudufitoxonolol.pdfIn PDF document text
    • http://vazesuna.pbworks.com/w/file/fetch/144508623/30863007428.pdfIn PDF document text
    • http://pigikeziba.pbworks.com/w/file/fetch/144902049/83756040405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d579919c-286c-4a75-9faf-685c91fb1efd/cloud_of_unknowing_swans_lyrics.pdfIn PDF document text
    • http://fisukafetif.pbworks.com/w/file/fetch/144419037/raven_cruizer_ii_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fc0a8d7-d79b-4a31-9b58-a72a86520400/transfer_line_chat_from_android_to_iphone_2020.pdfIn PDF document text
    • http://pejuzor.pbworks.com/w/file/fetch/144921255/uyire_tamil_mp3_songs_download.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_off0000ec3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3C 5540 bytes
SHA-256: ece02eab6c25bf88a40f79967010d04fe826b9cd14ee936639a3cf17973f7351
font_01_sfnt_off0000ff29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF29 10304 bytes
SHA-256: c5ae7cc0bcaf73c92711c7a4ece332785487cf3093bc49964a52e520c8b9d147

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