Malicious PDF — malware analysis report

Static analysis result for SHA-256 78da66d1be33ccdf…

MALICIOUS

PDF

72.4 KB Created: 2021-04-02 08:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 26409e564485defeb68c19e241fc6c6d SHA-1: 1190755bdc4fd1dad55852380876bb482c32c7d9 SHA-256: 78da66d1be33ccdfe6934ad60ea68babed02ab331cedfde06890a6ab48dcc1e7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://pelibifir.ru/123?utm_term=linear+inequalities+worksheet+key PDF link annotation
    • https://wuguruxozoza.weebly.com/uploads/1/3/4/0/134040539/kedukevipipurepibiv.pdfIn PDF document text
    • https://cdn.sqhk.co/dusujukakal/je39JGy/65336464936.pdfIn PDF document text
    • https://cdn.sqhk.co/nasonamav/4hhjbYv/12013608172.pdfIn PDF document text
    • http://figejewumoposes.getenjoyment.net/51397635204.pdfIn PDF document text
    • https://cdn.sqhk.co/kezixowog/dnjb2OL/stickman_rope_hero_mod_menu.pdfIn PDF document text
    • https://taxubixud.weebly.com/uploads/1/3/4/7/134760406/4151071.pdfIn PDF document text
    • https://vigenuwotefi.weebly.com/uploads/1/3/4/0/134012497/fupufiwuto_fokutewoperi_zipaluxebojosu_sipeku.pdfIn PDF document text
    • https://napajudiweji.weebly.com/uploads/1/3/4/3/134316113/larimamijutaxad.pdfIn PDF document text
    • https://ligetivegivug.weebly.com/uploads/1/3/4/0/134041815/7304705.pdfIn PDF document text
    • http://finomimetafix.sportsontheweb.net/maths_word_problems_for_grade_4_addition_and_subtraction.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/ZbGljfd/2nd_grade_math_lesson_plans_using_manipulatives.pdfIn PDF document text
    • http://vixitatevejiwo.getenjoyment.net/24492585420.pdfIn PDF document text
    • https://cdn.sqhk.co/pimupigedu/gdhjUoY/anime_girl_voice_changer_for_discord.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/0a37354f-266f-4c9e-8842-08d083aadb6d/knex_truck_instructions_easy.pdfIn PDF document text
    • http://bidejepeko.onlinewebshop.net/80623043077.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edd134f8-5aa7-410c-8bb7-7e20f4517f5c/50882887451.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_off0000dd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 5096 bytes
SHA-256: e9792e7d16ee659aae6e0b9b7888070939db6d0ce20b299fa1111c39f8ac1f23
font_01_sfnt_off0000eee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE3 11096 bytes
SHA-256: 0c7320a7b3f81332cef97733a3c8c1f1ff5e89c76184954767b5a2841cdf879d

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