Malicious PDF — malware analysis report

Static analysis result for SHA-256 c565bd8da8933ef7…

MALICIOUS

PDF

81.6 KB Created: 2021-04-10 00:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 9abbf627f83a5fc7a73f4a05ca60e407 SHA-1: eb5e11af0c374d6419a56f5ae6bd704c2c351485 SHA-256: c565bd8da8933ef7235dfcae32ff52e2585e717ca9c89a8f88f30afcdc344805
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant portion hosted on disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing and trojan activity. The embedded URLs, such as https://mezovuduw.ru/strik?utm_term=phrasal+verb+get+away+with+meaning, are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://mezovuduw.ru/strik?utm_term=phrasal+verb+get+away+with+meaning PDF link annotation
    • http://xawamiwupajev.mygamesonline.org/14624542107.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495402/normal_5fe35a8f2f036.pdfIn PDF document text
    • http://belepebo.mywebcommunity.org/xinalek.pdfIn PDF document text
    • http://zefujixa.mywebcommunity.org/vazege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449603/normal_602e98686eaa3.pdfIn PDF document text
    • https://cdn.sqhk.co/dagosasojo/hZifJhd/zedge_ringtones_latest_tamil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392210/normal_601fef20da51a.pdfIn PDF document text
    • http://walolexokesufa.sportsontheweb.net/situmuwokifonupapadowog.pdfIn PDF document text
    • https://cdn.sqhk.co/bipokagiti/hegdje0/72543604273.pdfIn PDF document text
    • http://sujimelowakolop.medianewsonline.com/palefugoruzufagorixefujax.pdfIn PDF document text
    • http://sugebowupubixo.mypressonline.com/interaksi_obat_antasida.pdfIn PDF document text
    • https://cdn.sqhk.co/jipogidara/hzYEjhP/78858477189.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawaferew/ugdigR7/gawetalazukare.pdfIn PDF document text
    • http://jenewazajasazu.getenjoyment.net/48596019964.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413843/normal_601ecb8ee0b5d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_fb551c7e70ee415c9f568fc07dee9f6b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f941ac4-b4c7-4f28-92bd-336f0a1c00d2/twilight_eclipse_full_free_online_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac39da6c-4996-44dd-94ab-5bf15b6d4db9/japilivaratufuvatanulafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc5629da-810f-4fa0-a3a3-82dfcee70aa6/pharmacy_technician_math_study_guide.pdfIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_45cd29d89d1a4cecbd75bddd2588210c.pdf?index=trueIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_3a6b78182460434598cc028c461b0a0f.pdf?index=trueIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_f32ca2169414434883344a8b2fd04dc0.pdf?index=trueIn 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_off000101bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BF 5492 bytes
SHA-256: ea2e8669065a9443ce9a571878b21619faf2233924be3c8f9b3b3e5b0d4a5e86
font_01_sfnt_off0001145f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145F 10784 bytes
SHA-256: dc0d56d4d84ab774eecf9408d1e73027d88f5a0604658afa2a93a47512a8c658

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