Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31498762663e185…

MALICIOUS

PDF

88.0 KB Created: 2020-11-18 06:20:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c11a3c1936a3e237c6bd075293b9ac39 SHA-1: ba298a654365d70657dd0990aad8d6bcc61cb74f SHA-256: d31498762663e185d34a1378fdba06986cdaf8278ce38414d385b4e22b2d100d
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document body, though heavily obfuscated, contains references to 'Google expanded text ads template' and 'wkhtmltopdf', suggesting a lure or a method of generating malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=google+expanded+text+ads+template In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412575/normal_5f94e35e529a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371514/normal_5f91be05144c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383923/normal_5f91f1e8bb852.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420907/normal_5f978272eb4f3.pdfIn PDF document text
    • https://rozapalevode.weebly.com/uploads/1/3/4/7/134705228/wogujuzopevub_lebusanela.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/1e39b855-28b8-423d-a218-dcebb12cef27/area_model_multiplication_worksheets_grade_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/445bb56c-8736-4174-8df6-e93632b465a1/new_dress_white_uniform_navy_instruction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0f09e4c-6a9a-4616-ba95-942cdbdc13ca/search_inside_yourself_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79ca7758-f609-45cd-b170-530cebecc512/sojutero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f9e4a1f-d008-46d2-a29f-4c1129f9e2b8/28183649394.pdfIn PDF document text
    • https://s3.amazonaws.com/potevip/83404977255.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/honda_gx240_engine_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/277a4a3f-8a0d-4002-aa45-9806e6d4d5f8/human_physiology_an_integrated_approach_7th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddb0ef08-ae13-4c09-ae3f-b944f24d3c32/scrawny_to_brawny_workout.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bb457f5-9b98-4f65-99aa-4072e574798f/enthalpy_of_reaction_and_calorimetry_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fcde949-1fcc-4984-ae88-ff4b06a88ba2/one_summers_day_saxophone_sheet_mus.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_off00010a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A09 5020 bytes
SHA-256: 853729d72fbe09c00685e3c89981d5b52c9b28a63d65a52ed4c68df6f5af1b9f
font_01_sfnt_off00011b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1B 12288 bytes
SHA-256: 7b10302f73afeb73076c563a299d9afcb4cc60bf84f3832bdadbbb43737bde85
font_02_sfnt_off000144b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B4 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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