Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6d274160cd457e…

MALICIOUS

PDF

71.4 KB Created: 2021-06-11 04:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7b9bf29fca051a4170d4b9baedb44d09 SHA-1: cbd05cde84d6d102d1fe0f50ed020ed8761488e9 SHA-256: 3d6d274160cd457e4c3df986fdd815ca64657ad73e42d51c7b5323810340c7d2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and also by an ML classifier. It contains an embedded URI pointing to 'synerhu.ru', which is likely part of a phishing or malware distribution scheme. The PDF structure and embedded content suggest it's designed to trick users into visiting external, potentially malicious, links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://synerhu.ru/pbw?utm_term=jeevan+saral+chart+pdf+download PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d041ec6-5036-480f-8c43-cfeab1925b62/33361542111.pdfIn PDF document text
    • http://gitefov.pbworks.com/f/organic_chemistry_as_a_second_language_4th_edition.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/f/diana_hacker_a_pocket_style_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c04dd00-bb7a-4fed-b968-37a9ec28e7bc/lugifomem.pdfIn PDF document text
    • http://tazijebep.pbworks.com/w/file/fetch/144428022/33303751918.pdfIn PDF document text
    • http://goferupemo.pbworks.com/w/file/fetch/144629436/alaipayuthey_movie_download_tamilrockers_cl.pdfIn PDF document text
    • http://rubuxesi.pbworks.com/w/file/fetch/144839028/55495234186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/452a69e2-377a-43cb-892c-3211e060d1d1/salary_of_food_safety_officer_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d090be1b-80c8-4909-bcfd-bee063b23284/96369216919.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/573930fe-8e89-4e58-8f8d-b8d75becaed7/formulas_volumen_de_prismas.pdfIn PDF document text
    • http://gemometis.pbworks.com/f/how_to_setup_hp_officejet_pro_8620_wireless.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/439dbfc4-18f1-4c4f-b675-9cd0798ac851/d-link_dir-615_manual_romana.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/what_is_carer_payment_and_allowance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dce8be6-c24f-4a39-ad47-b507ce8765d2/vawuvoxafuko.pdfIn PDF document text
    • http://fosodijo.pbworks.com/f/smart_phonics_1_new_edition.pdfIn PDF document text
    • http://pewudomame.pbworks.com/w/file/fetch/144621423/dream_girlfriend_hack_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5e38e41-f8cd-4693-85eb-ff5c86a95f47/integrated_chinese_workbook_level_2_part_1.pdfIn PDF document text
    • http://sukagafamo.pbworks.com/f/the_son_of_bigfoot_characters.pdfIn PDF document text
    • http://pukagij.pbworks.com/w/file/fetch/144586326/how_to_add_yeast_nutrient_during_fermentation.pdfIn PDF document text
    • http://vawaguzidatu.pbworks.com/f/vintage_free_printable_stationery_black_and_white.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/249a7289-915b-4065-b723-66dc5c4522aa/poxonopaj.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_off0000dae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE1 5384 bytes
SHA-256: 3fc4276f42df05a63d20d5174cbeccc3099048017f1931819c098af83b3b341c
font_01_sfnt_off0000ed43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED43 10252 bytes
SHA-256: d64802032b324dd0767aab0b7f430a9ab9fa00519bec7ed731c9ff53bd8dbe13

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