Malicious PDF — malware analysis report

Static analysis result for SHA-256 13710d4b6fe9454b…

MALICIOUS

PDF

86.2 KB Created: 2021-04-05 07:40:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 220afadccf1bcc2c5e1e96b9f29c0ed6 SHA-1: 781373a0be7dd3eb59eabd08e981fae15ac5ef87 SHA-256: 13710d4b6fe9454b84b1fb74efb0929c746fad9ba3cb52eaa7d6bbc359a4b75c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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://bologen.ru/award?keyword=manual+apa+2020+pdf+descargar PDF link annotation
    • http://dozixolabizije.iblogger.org/iso_27001_external_audit_report_sample.pdfIn PDF document text
    • https://wuvenenuw.weebly.com/uploads/1/3/1/3/131383928/fegizo-bulipokijonenon-sovafake-zaxonazati.pdfIn PDF document text
    • http://fevofawemuwa.medianewsonline.com/tatezep.pdfIn PDF document text
    • http://xatovapotogu.mywebcommunity.org/afacerea_dreyfus.pdfIn PDF document text
    • https://robevumike.weebly.com/uploads/1/3/4/7/134767989/norabarinojubena.pdfIn PDF document text
    • http://jesiwufap.iblogger.org/95819061825.pdfIn PDF document text
    • http://pazefezos.mywebcommunity.org/parenabizawexumoka.pdfIn PDF document text
    • https://pukexomupuko.weebly.com/uploads/1/3/1/1/131164185/wizukari.pdfIn PDF document text
    • http://dotavulilego.mypressonline.com/tagaj.pdfIn PDF document text
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/remufakunedaxika.pdfIn PDF document text
    • http://widonatozeg.mypressonline.com/notaxoka.pdfIn PDF document text
    • http://bupitubegedew.getenjoyment.net/dafudutomirulutofuwi.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/fatikonavori/25124019591.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40be985a-af2e-458c-bb5e-99bc6e779656/what_is_the_integral_of_cos_squared_x.pdfIn PDF document text
    • http://lugebobakigojom.rf.gd/bcece_le_question_paper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f5de4f6-dc1c-434e-b988-78b8db150742/1998_jeep_grand_cherokee_parts_catalog.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/nice_guidelines_incisional_hernia_repair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ada0102c-ddde-4e3f-a282-ddc05eb34627/63018040898.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/954d8490-641a-4546-a115-e212da70b668/financial_management_theory__practice_15th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/what_is_the_electron_configuration_for_the_element_sulphur.pdfIn PDF document text
    • http://mevanuzexujen.rf.gd/3672485190.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a869ef9e-7041-48fe-b452-5ccf21d7f646/39945796389.pdfIn PDF document text
    • http://nabunuwo.epizy.com/zimixenuxa.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC81 5600 bytes
SHA-256: db0363d0be81787bb66613a3422c69d6038a0f54786e0dd321e3d7982cc6ff16
font_01_sfnt_off0000ffaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAF 2920 bytes
SHA-256: 96c201ba984533b0ed8b63055ab5ee123c89a199c69c993c0433f2caf030b38e
font_02_sfnt_off00010ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA5 12616 bytes
SHA-256: 5e14cdc0cf317813dde3fca054de35800f4c9db53cd0e716045e364801a84b26
font_03_sfnt_off0001348d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348D 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550