Malicious PDF — malware analysis report

Static analysis result for SHA-256 8421b34b011c729b…

MALICIOUS

PDF

75.6 KB Created: 2021-03-24 03:32:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: cecf30e599e30edd6cad5f902b04064b SHA-1: 578e77d6ee9cc60d2f62cf2cffcda5e13554db5e SHA-256: 8421b34b011c729bb75aaf1bc253c64136521d9f16eebdaada3a140463a9dd25
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-spam-like URLs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://maypoin.ru/award?keyword=back+exercises+pdf+aaos PDF link annotation
    • http://fobativ.mywebcommunity.org/fibugonogu.pdfIn PDF document text
    • http://kerosijuvibeg.scienceontheweb.net/bipolar_disorder_2020.pdfIn PDF document text
    • http://kobodesuwid.getenjoyment.net/rumagin.pdfIn PDF document text
    • http://boforotaje.mywebcommunity.org/how_much_does_a_500ml_plastic_water_bottle_weight.pdfIn PDF document text
    • http://rubewox.sportsontheweb.net/81365637323.pdfIn PDF document text
    • http://wutanumijejol.sportsontheweb.net/mufilisol.pdfIn PDF document text
    • https://pifaxatopegamu.weebly.com/uploads/1/3/4/1/134108845/20ecfc9e90e2bd9.pdfIn PDF document text
    • https://zajadibagaku.weebly.com/uploads/1/3/5/3/135341716/buniwawekan.pdfIn PDF document text
    • https://balesiloruj.weebly.com/uploads/1/3/4/6/134671801/2011097.pdfIn PDF document text
    • http://wudaxozibutix.sportsontheweb.net/la_prhistoire_africaine_l_afrique_berceau_de_l_humanit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zunaporam/physical_examination_of_gastrointestinal_system.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/wasteland_2_squad_guide.pdfIn PDF document text
    • http://gesubonepalit.epizy.com/best_application_letter_format.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/kopifuvubozubofover.pdfIn PDF document text
    • http://vokotikif.epizy.com/bemubivonipe.pdfIn PDF document text
    • http://xudixarosojem.epizy.com/how_to_schedule_an_appointment_for_your_drivers_license.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fd18122-bca0-4bad-966b-5abe71ae0829/vavakivuteji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dedd0d01-a78d-43a3-82c2-221b542d2437/96822148273.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/kumikatevirofu.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/wogikupogena.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_off0000ec5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 5296 bytes
SHA-256: f2312ac5e31c75da4e341e3b05e24c6dc05f14ec247c89c80f03c52ffcaf7194
font_01_sfnt_off0000fe7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7B 10312 bytes
SHA-256: d5e11d40c8c48ebf200c1a1f15bff0f6bc4ab90fcc2e795bd8b9dea55c8ab250

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