Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf24f041dd33bd0…

MALICIOUS

PDF

78.0 KB Created: 2021-05-03 12:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ed9f4fc97627c93183eace0295aeff0b SHA-1: 88fbd80ff56c0e744b7d1c11a8a40e68601ffe3d SHA-256: fbf24f041dd33bd07842480d2932ea3a3e79ce36575d7e9d9e16c3903028e948
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/strik?utm_term=how+to+reset+luminous+inverter+overload PDF link annotation
    • https://buxijoxusezo.weebly.com/uploads/1/3/1/4/131483018/773f9b743b.pdfIn PDF document text
    • http://womaruzufoxila.iblogger.org/gewininolejifinetixime.pdfIn PDF document text
    • https://lunixomowomok.weebly.com/uploads/1/3/4/8/134859132/rumuwijewifiku.pdfIn PDF document text
    • https://guxofavopadowan.weebly.com/uploads/1/3/5/9/135988616/kumaxama-diforalu-nemazopejafaf.pdfIn PDF document text
    • http://getveran.site/nedojuxitukosi46obe.pdfIn PDF document text
    • https://mekupefaju.weebly.com/uploads/1/3/5/3/135316310/wepideziw.pdfIn PDF document text
    • https://tirepululavapiw.weebly.com/uploads/1/3/4/5/134576363/4769948.pdfIn PDF document text
    • http://nofomunagipu.iblogger.org/64th_bpsc_mains_question_paper_download.pdfIn PDF document text
    • http://ital-girl.space/21823387922wagaa.pdfIn PDF document text
    • https://wivusogonelom.weebly.com/uploads/1/3/5/3/135310870/63c5eb9b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/94393014-868b-481d-a08c-351fe23b0894/rokunonozikaman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb6409fd-8333-4581-b0cd-df72ef7ad881/is_paternity_leave_a_law_in_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/676c14b3-af37-489c-a2aa-bf054398c8e1/nepaxufogumunuxuvona.pdfIn PDF document text
    • http://jukopiwiguf.rf.gd/how_do_you_fix_code_33_on_a_carrier_furnace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fef6a0f-83fe-436f-a206-7de430b9c391/skyrim_list_of_books_that_start_quests.pdfIn PDF document text
    • http://zaximibirada.epizy.com/65660602582.pdfIn PDF document text
    • http://dubabin.rf.gd/18931290788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/882b5cbc-a990-4aab-b5b7-d56a4e33c041/retepotokudozono.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_off0000f55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 5084 bytes
SHA-256: 552a1b6b1f92d28c2a79f0d0f8897f15afe9eabae9ccb6667ee34849d766bb45
font_01_sfnt_off0001069c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069C 10712 bytes
SHA-256: fb312f3dde26eeadae8e372c6a03850fd34235096a2df70e38a1fee34b63b5e2

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