Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b6378bbdf691f3…

MALICIOUS

PDF

72.2 KB Created: 2021-06-03 02:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6004d8621ddd3eecb524c45e48172e17 SHA-1: 5c1d078934c9811e0fc40c8f049986083c6da6d8 SHA-256: d9b6378bbdf691f324e1fbca6b59a7d7778d6ba01b0ff7cbfa943a5c4fb1088a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link-farming campaign. It contains numerous external links, with one pointing to a URL that appears to be part of a link farm. The document's structure and the presence of many external links suggest an attempt to direct users to potentially harmful or misleading content, rather than providing legitimate information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/pbw?utm_term=how+long+do+you+cook+a+ham+in+a+roasting+oven
    • https://static.s123-cdn-static.com/uploads/4484612/normal_5fcc0a737dac5.pdf
    • https://nowitijot.weebly.com/uploads/1/3/4/7/134716658/fukimat-kowugepadi-virebenib.pdf
    • https://static.s123-cdn-static.com/uploads/4387566/normal_5feb59c126aaf.pdf
    • https://cdn-cms.f-static.net/uploads/4417046/normal_6011d5c215019.pdf
    • https://cdn-cms.f-static.net/uploads/4409628/normal_604b31f43b8a9.pdf
    • https://vilemanunopabom.weebly.com/uploads/1/3/4/3/134317174/jugupixijufeguto.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sazupamufode.pbworks.com/w/file/fetch/144447555/vafanubolijomotanibab.pdf
    • http://bopelijexuf.pbworks.com/f/cell_cycle_mitosis_and_cancer_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/cf81ea44-340d-435f-be4a-8c48cfb724c6/nekenoveruzu.pdf
    • https://uploads.strikinglycdn.com/files/17416569-394f-46dc-9d06-2b46c93245d7/what_is_the_best_treadmill_workouts_to_lose_weight.pdf
    • http://mavujeridolu.pbworks.com/f/fundamentals_of_fluid_mechanics_6e_munson_solution_manual.pdf.pdf
    • http://degenazi.pbworks.com/w/file/fetch/144456888/holt_handbook_second_course_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/a9e6b382-bb0c-4f0b-8ee5-d5818c3ab659/jiwimuranudan.pdf
    • https://uploads.strikinglycdn.com/files/d34ecfec-e4cc-4e3d-948a-22680b1a56f8/how_to_write_a_review_for_a_coworker.pdf
    • http://xelivolofuso.pbworks.com/f/rig_veda_samhita_in_hindi.pdf
    • https://uploads.strikinglycdn.com/files/de42506b-1cc2-4123-89e3-f3232071fa5a/62071290261.pdf
    • https://uploads.strikinglycdn.com/files/ec1a779c-01ab-4db1-854f-aed283e92273/a_second_declaration_of_independence.pdf
    • http://tukufidanega.pbworks.com/f/supplier_satisfaction_survey_template.pdf
    • http://mefijunov.pbworks.com/w/file/fetch/144421125/can_we_convert_2d_to_3d_in_autocad.pdf
    • http://sujagajo.pbworks.com/f/zetirarazivikug.pdf
    • http://fisukafetif.pbworks.com/f/bininexafiru.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de9a.bin
9e800812faf106d4ecef3e6825108433936b34bb759faaa6d4f256833a2e833e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9A 5632 bytes
font_01_sfnt_off0000f1bd.bin
1298362579945f6756d3e6911b64795e60465369761e9937b48d0488d0774508		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BD 9836 bytes

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