Malicious PDF — malware analysis report

Static analysis result for SHA-256 366daf57850e9629…

MALICIOUS

PDF

75.1 KB Created: 2021-05-31 23:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8c0de1315b4985d679c4d531f16bfca9 SHA-1: e566fe575b76fb95467acc677245d9144ff12eb8 SHA-256: 366daf57850e962908397df4e94a3037224f90f7ac5fc1832515568a9249d57f
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics, including ClamAV and an ML classifier. It contains a link farm with numerous external PDF links, one of which is a suspicious URL pointing to 'pixomot.ru'. The document body, though truncated and obfuscated, suggests a lure related to 'Ielts academic writing task 2 samples'. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to drive traffic to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://pixomot.ru/pbw?utm_term=ielts+academic+writing+task+2+samples+with+answers+pdf PDF link annotation
    • https://siravexadobema.weebly.com/uploads/1/3/4/3/134320718/komutitana.pdfIn PDF document text
    • https://wanukepaxe.weebly.com/uploads/1/3/4/4/134454717/sefawobitizonutora.pdfIn PDF document text
    • https://sivasanetit.weebly.com/uploads/1/3/6/0/136095735/xutaderikokijox_wixumekibufe_kulegujakuferek_sijediwud.pdfIn PDF document text
    • https://xexofudef.weebly.com/uploads/1/3/4/3/134339501/fited.pdfIn PDF document text
    • https://wosepujejos.weebly.com/uploads/1/3/4/6/134649517/kaxax-monuba-zuvunipenovove.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c99eb663-41cf-42a1-8446-d7058d6fbdf5/91443324314.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39bb6629-9362-442b-a35e-16dce3974626/47850559801.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfc80106-b06a-4c22-af3c-bdd1a6628b53/kenmore_elite_front_loading_washer_leaking_water.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7f2d0d2-2402-40e9-b10f-9ef926f41dcc/sharp_air_conditioner_specifications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aac4f3f-0c9d-43bc-8209-57c698ddcd6c/fetagamoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18f7278d-e233-4abd-8cc0-2b2e4c85259f/download_minecraft_java_edition_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1c09981-e5ce-4112-8b1a-aa594165c2e9/59137541134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96486be6-3ee4-4265-aa9a-2f2e9aed8f29/liftmaster_8550w_error_code_4-3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53c40469-0d2c-4df5-bffd-f1a8ed20f614/edtpa_handbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0350663e-dc16-459d-963a-d2b30efd606e/fetopalowukozalarawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf69d446-bfa3-40e0-9e0b-f52b90bac567/21259647896.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01af7652-11f9-42c8-8763-14ee0e69abc9/clinical_guidelines_in_family_practice_5th_edition.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABA 5472 bytes
SHA-256: 6ca573474c6fb1c62de7d7c9e5f3d4dc32436cc922a44e895f849a8b1473d486
font_01_sfnt_off0000ed3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3A 9740 bytes
SHA-256: 98eff2ab1badc5e9ccff23267364b7c7ed028853fc55b9f6fd4f57487cf88f67
font_02_sfnt_off00010e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E94 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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