Malicious PDF — malware analysis report

Static analysis result for SHA-256 019f1dba199c5bc8…

MALICIOUS

PDF

111.9 KB Created: 2021-03-27 17:55:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: dcd11b9efef8b40c302045bc8b91d0fa SHA-1: fe013f2aba0868b476f4372ea7afd43d7352c9f9 SHA-256: 019f1dba199c5bc8ffd423fb6eef6a496ff68bf426bf5968f5bbbc192e9a379a
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains text related to 'popular lexile books' and application metadata, suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=popular+1200+lexile+books In PDF document text
    • http://8gusevshop.space/xibabopaul5ch.pdfIn PDF document text
    • http://familyit.pro/62688217439iq7e0.pdfIn PDF document text
    • http://help-business-media.com/75046562352jyfe4.pdfIn PDF document text
    • http://cz-nitrof.website/what_questions_to_ask_in_a_vet_school_interview9c5o8.pdfIn PDF document text
    • http://jobware.pro/rol_y_estatus_socialk52ig.pdfIn PDF document text
    • http://gedawirij.66ghz.com/32286549300.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/iv_convenio_de_ginebra_1949vwkfa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kegeduwamid.epizy.com/project_almanac_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/dozurukapibakedevire.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/85850111126.pdfIn PDF document text
    • http://bizosubage.rf.gd/79425155140.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/43199542172.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/how_to_pair_resound_hearing_aids_to_samsung_tv.pdfIn PDF document text
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_eaa6cc1d2a56445eb2bd913cbc075705.pdf?index=trueIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_36c31085456645d2a5d79f0e19d5b910.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/cuphead_dice_boss_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/34506128943.pdfIn PDF document text
    • http://fabodatutowew.epizy.com/joules_boots_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/alarm_controls_1200d.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/casio_mudman_solar_atomic.pdfIn PDF document text
    • http://gonesipida.epizy.com/sintomas_de_cancer_de_pancreas.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/14561300814.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_off00017813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17813 5412 bytes
SHA-256: 44ca36c06f3ebc12fec9c2eda707599957191715b6902919dba313d399e150f9
font_01_sfnt_off00018a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A81 11272 bytes
SHA-256: 5f7a6f627a77d5af8309658439a143bf985c94d5b4b419df8748e9bc1b404c2a

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