Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d01c0f1def2841…

MALICIOUS

PDF

77.4 KB Created: 2021-06-10 16:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2c7952e432a2c677dddccf838323f971 SHA-1: e512086ed484f0b8e4ae12c7946225c4455d63ef SHA-256: 25d01c0f1def284114a62d26d8d8039351b6309231b87a3fbfcfc00f604304bb
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a heuristic firing for a large number of external links, with one suspicious URL pointing to 'nipisod.ru'. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/123?utm_term=2+player+game+for+android+free PDF link annotation
    • https://zerurejapom.weebly.com/uploads/1/3/5/9/135964845/gatikuvafumobe.pdfIn PDF document text
    • https://raxasowofano.weebly.com/uploads/1/3/2/6/132681821/7660274.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/506df68e-c4f7-4aa6-b79b-bb6db5d18414/how_to_find_the_mean_from_a_grouped_frequency_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e44fa67-39be-444f-b4c8-8d4febd66336/wayne_dyer_funeral.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/w/file/fetch/144846000/siwigofifaxage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0783e3d0-5888-44d7-9744-343d7af4f191/partition_au_clair_de_la_lune_ukulele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/029f9a9a-78f0-48e3-b112-3b497297f944/schauer_battery_charger_manual_jac2024h.pdfIn PDF document text
    • http://puzavofan.pbworks.com/w/file/fetch/144714522/pubufe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1ccf95f-a264-4a83-9777-5c62af9af6de/37879825732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc2967c8-04e2-425a-b7a8-efca7a242c65/99988491666.pdfIn PDF document text
    • http://lalunanefiw.pbworks.com/f/molazogojipavefojojur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5be63dc0-3ebb-4124-b29c-3714f8692dfc/harbor_breeze_remote_control_ceiling_fan_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58f9d02c-4242-4f76-baad-913b1fc4df14/exercises_on_phrases_and_clauses_for_class_7_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30259086-a424-41fa-8ad4-5b905990ecda/xovinutukuzimobiredim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/674f67b6-e6a6-4cfd-9812-1180b9a9482e/what_does_ch_mean_on_lg_air_conditioner.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/w/file/fetch/144838032/full_body_workout_with_weights_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23495d01-e5c3-4962-9791-0af32285db77/61126689243.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_off0000f2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E2 5320 bytes
SHA-256: 4f520ab3fccd334c1902915d9e3b9b52b34fcf2077a4523bd7e7860022375fb5
font_01_sfnt_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 10492 bytes
SHA-256: b69fe4c71721b591f4e69a302d79a4b8398b3e1a7cba6475a08a62c61cd7384e

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