Malicious PDF — malware analysis report

Static analysis result for SHA-256 540c6fe2a3987136…

MALICIOUS

PDF

73.7 KB Created: 2021-04-02 22:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 01e3a824af8a1bf4d1e18837e6a2e31c SHA-1: 0ef84f4ee6e883459721871d5e35cfbbb470be3f SHA-256: 540c6fe2a39871365da851132a27e05e48a7f0c4dca856bdaf123cc17cc69f7b
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, with at least one pointing to a suspicious domain ('xajibur.ru') that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to obscure the malicious destination through a network of disposable hosting. No scripts were extracted from this sample, but the presence of external URIs and the overall detection profile strongly suggest it's part of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://xajibur.ru/award?keyword=danstoker+boiler+manual+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393499/normal_5fe24b76233b1.pdfIn PDF document text
    • https://nolaxefipox.weebly.com/uploads/1/3/4/7/134740184/4c0e51ac7e16.pdfIn PDF document text
    • http://zaxiluxedexu.getenjoyment.net/meteor_js_tutorial_download.pdfIn PDF document text
    • http://thecet.xyz/vodijugutijujemewunuzoue9uu.pdfIn PDF document text
    • https://kiwaposuxixu.weebly.com/uploads/1/3/5/3/135329520/d41c5746acfc.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/87237424322.pdfIn PDF document text
    • http://xoxanuf.mygamesonline.org/tikamodavetepexizutolu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470821/normal_604d6435dbc1f.pdfIn PDF document text
    • https://rutikaxa.weebly.com/uploads/1/3/0/7/130738846/3c4f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484997/normal_60217b50e9dc2.pdfIn PDF document text
    • http://espaceabonnes.com/microsoft_powerpoint_infographic_templates5y5o6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/68d6338c-77aa-494e-b8ee-304158c57399/kiss_the_rain_ukulele_tabs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d07c28c-529a-4d82-a324-eec10201e5ca/here_is_new_york_9_11_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b789329e-1321-4a21-af4c-d2931774e2c7/when_was_the_lenovo_t420_released.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dd3e8ce-48f4-4272-b479-34801e90bce6/integral_calculus_multiple_choice_questions.pdfIn PDF document text
    • http://xomapagovujux.atwebpages.com/afinidades_revolucionrias.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cb82d21-0a46-4842-bcc1-db5d70de3dbb/how_to_factory_reset_kindle_d01100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5af5f69a-add4-4e6f-8824-b447bab118c8/how_to_use_ge_universal_remote_control.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_off0000e3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E3 5392 bytes
SHA-256: 0ca3fda34129ec547f7d3ea0052763f679f68aad244ad6c99c6b3afc10d3a619
font_01_sfnt_off0000f626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF626 10476 bytes
SHA-256: 579f25f6a067b4079554f35bd62cfe2ac541d842ac349ccf2c177381f68157cd

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