Malicious PDF — malware analysis report

Static analysis result for SHA-256 e624fc452fe68645…

MALICIOUS

PDF

77.9 KB Created: 2021-04-24 16:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8ba1b5a1f716a672472a1693447408b SHA-1: 5cedc7be348ecee809c100613f0f0d7e5976fccf SHA-256: e624fc452fe68645e57d8ed4ff03deabc767ca435e15bee16c8424783104feeb
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of a large number of external links, with one pointing to 'http://poxotoromerolu.rf.gd/american_vision_history_book.pdf'. The embedded URL 'https://kuzutuzo.ru/strik?utm_term=how+to+clean+a+honeywell+filterless+humidifier' suggests a lure to a potentially malicious site. The document body, though heavily obfuscated, contains text related to humidifier cleaning, likely a pretext for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=how+to+clean+a+honeywell+filterless+humidifier
    • https://tibiwoxot.weebly.com/uploads/1/3/4/8/134881218/1380368.pdf
    • https://cdn-cms.f-static.net/uploads/4408881/normal_6059076d630bc.pdf
    • http://nenugatigubom.66ghz.com/pupujenefalulugozaw.pdf
    • https://cdn-cms.f-static.net/uploads/4470399/normal_6050b29bdad9b.pdf
    • https://senovaxevuka.weebly.com/uploads/1/3/5/3/135304629/tositibulowe_tudijebiga_vopusogapaju_wibudejum.pdf
    • https://static.s123-cdn-static.com/uploads/4379742/normal_5fe5a1be03ee0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://poxotoromerolu.rf.gd/american_vision_history_book.pdf
    • https://s3.amazonaws.com/mibiwivanetuj/asepsia_definicion.pdf
    • https://s3.amazonaws.com/rimejiguvif/nabosiregamopa.pdf
    • http://timawerana.epizy.com/value_investing_stocks_right_now.pdf
    • https://s3.amazonaws.com/boduxatavepe/brownian_motion_video.pdf
    • http://gibivugaxuma.rf.gd/belayim_petroleum_company_annual_report.pdf
    • https://s3.amazonaws.com/pukiza/5594701285.pdf
    • http://kedukukixef.epizy.com/962705532.pdf
    • https://s3.amazonaws.com/zobuwubedak/eureka_airspeed_exact_pet_filter_replacement.pdf
    • http://fojoxolizono.rf.gd/retuxegikugo.pdf
    • http://zusiwuso.epizy.com/sotuvijirozisef.pdf
    • http://xazomagojuwa.epizy.com/tmt_bending_machine_mechanical_engineering_project.pdf
    • http://pusevim.epizy.com/nitafesozaboko.pdf
    • https://s3.amazonaws.com/runuzitexokol/sumusupew.pdf
    • http://pugavidugipiton.rf.gd/68919404890.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efec.bin
9de4956b02c4c21db9287c26a2a73218f20863cbb68acee19196293039141717		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEC 5416 bytes
font_01_sfnt_off00010244.bin
73acab17393d20791596b64b078e0e679457e47498c27426d70f996e726b7483		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10244 11808 bytes

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