Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7865cea6622851…

MALICIOUS

PDF

66.3 KB Created: 2021-06-05 19:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4ceafbc6b2046797b79d567dbf745ecd SHA-1: d793a8ad207068760bb5adbf74e0212708ff121e SHA-256: 4b7865cea66228512dbc1d638d18b4d78bd7d65403fb09871edd298ce0d2b7d9
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL leading to a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, appears to be a lure related to search terms, aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6022

Heuristics 4

  • 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 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
  • 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://chcial.ru/pbw?utm_term=sonu+ke+titu+sweety+cast+name+with+photo PDF link annotation
    • https://rafogemi.weebly.com/uploads/1/3/4/7/134754229/1721510.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410204/normal_5fe734cb213e5.pdfIn PDF document text
    • https://napolodakuziman.weebly.com/uploads/1/3/0/7/130775867/muvokazosesupe-fotesipomuvuja-tasuwi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502567/normal_5fe1446fd06e8.pdfIn PDF document text
    • https://nonewufuro.weebly.com/uploads/1/3/4/3/134334506/7916540.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443610/normal_60119047e5694.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446643/normal_60140a44c6f3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403940/normal_6059d741318e7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://volikedejefa.pbworks.com/f/67459397062.pdfIn PDF document text
    • http://zezimin.pbworks.com/w/file/fetch/144412407/islamiat_general_knowledge_mcqs_in_urdu.pdfIn PDF document text
    • http://memofemovo.pbworks.com/f/carnatic_music_lessons_in_malayalam.pdfIn PDF document text
    • http://fagimox.pbworks.com/w/file/fetch/144512871/why_is_my_furnace_not_kicking_on_in_my_camper.pdfIn PDF document text
    • http://nadupodifado.pbworks.com/w/file/fetch/144431499/download_private_instagram_stories_apk.pdfIn PDF document text
    • http://serizedez.pbworks.com/w/file/fetch/144629460/goulds_pathophysiology_for_the_health_professions_6th_edition_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3743bf09-a379-4ceb-8652-65d00b2c821c/how_to_make_aluminium_billet.pdfIn PDF document text
    • http://zufiwuz.pbworks.com/w/file/fetch/144472077/geropatovudivujurefosat.pdfIn PDF document text
    • http://sinorodolu.pbworks.com/f/sawativobejoxapidevuvopix.pdfIn PDF document text
    • http://sejiliki.pbworks.com/f/why_wont_my_wifi_repeater_connect_to_the_internet.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/f/therapeutic_massage_techniques.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52720124-476f-4df8-9c72-1534778109a2/doraemon_wii_game_download_apkpure.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/f/kalnirnay_april_2019_marathi_calendar_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e97898e-cac4-4a4e-879f-54d7a5ab46f2/cabrio_washing_machine_error_code_dr.pdfIn PDF document text
    • http://lodenapokot.pbworks.com/f/geek_vape_aegis_x_user_manual.pdfIn 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_off0000e2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C0 5288 bytes
SHA-256: 6936c374218bcedee67f14e6948b0cde28e508bf630e0e5e6b9b79cf2e47b303
font_01_sfnt_off0000f4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A3 1936 bytes
SHA-256: a8ba320a0ac8a73a5a8cc2c47ba30bd151ec5f51af4d5ac0b9daf85eaa8f1301

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