Malicious PDF — malware analysis report

Static analysis result for SHA-256 7377cde2f4449e53…

MALICIOUS

PDF

84.7 KB Created: 2021-03-22 15:04:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8e075444f620722b48f59efa5297df60 SHA-1: 51b705042286c61afce1d5cf462cc73574d939ef SHA-256: 7377cde2f4449e537ce448b8efc449f3e0243d7e95452453c3969e5e1a9efcae
186 Risk Score

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 0.9995

Heuristics 6

  • 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 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://zajinet.ru/wix?keyword=spiderman+total+mayhem+apk+data PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416671/normal_5fe124a44c37a.pdfIn PDF document text
    • http://motorutovibipe.sportsontheweb.net/star_wars_thrawn_trilogy_books.pdfIn PDF document text
    • http://lejidakoxinetog.mywebcommunity.org/kodakumetut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417824/normal_6004e88c6d25a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386091/normal_5fe10a4e4d314.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/ede53f3b-a91d-49fc-9978-f0d9770ec58d/ready_new_york_ccls_grade_7_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/153c0a05-e96e-4d72-9157-02316d65b936/kadirixixulavubazitisozen.pdfIn PDF document text
    • http://bugenerefajujus.atwebpages.com/what_is_the_meaning_of_star_crossed_lovers_in_romeo_and_juliet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2819a92-a87b-4707-bf0a-645c39c56e8e/setap.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/indices_and_logarithms_exercises_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab5c5335-4472-4628-a645-3fd351ee18bf/fuzumeredoregobivekala.pdfIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_fb9128cfa20c463fa1d4fc4559687a75.pdf?index=trueIn PDF document text
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_2a23e2baa95a4e0a991661121e74674c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/xaguninas.pdfIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_71abf89de2774ab6b178c3f3c35ba43a.pdf?index=trueIn PDF document text
    • https://3789e5f8-265e-48cd-8836-241a044b7ceb.filesusr.com/ugd/45ef7e_f7a66c3c9f3847a7a026bfd79d8b2191.pdf?index=trueIn PDF document text
    • https://527ed197-5826-4432-9c89-449afa9d705e.filesusr.com/ugd/65ef70_bb533f94794a433c9a63daceaf9a2503.pdf?index=trueIn PDF document text
    • https://75cc4b12-69da-4024-8422-75f9303faa99.filesusr.com/ugd/d6c222_c74201baeb7a4f61be4d9ea5e949cd39.pdf?index=trueIn PDF document text
    • https://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_12a59fa1d94c43ad923027dfc0465d57.pdf?index=trueIn PDF document text
    • http://nafaradevofipaf.myartsonline.com/ccna_voice_configuration.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/28714515558.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/wheel_horse_520h_service_manual.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46B 5288 bytes
SHA-256: 6ba25af40016cfdd4c590e842697822a89b05beb46fdee81e794297dfec8bd24
font_01_sfnt_off00010641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10641 11016 bytes
SHA-256: 95415e749ab7ce1850326446748facb06c9d0f0d8d8b83c0cb1827d91252759e
font_02_sfnt_off00012c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C47 17188 bytes
SHA-256: 379815279dc7a464767c3fd6bedcba3f73feddcaa013808a1cda34b40f2816b2