Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1a92ee58bb98f2…

MALICIOUS

PDF

74.1 KB Created: 2021-05-13 19:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8a59a6a451b15e367b301800269714fb SHA-1: 2c3161453d1ac8df15460004e9855c65ddecaf0c SHA-256: 7f1a92ee58bb98f21b7ff031d5b97abecd3980a61a17a39e141bdcd434fecb85
244 Risk Score

Malware Insights

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

This PDF file is classified as malicious, containing a link farm with 30 external links, many of which point to known malicious redirectors or disposable hosting. The document body, though heavily obfuscated, suggests a lure related to machine tool design. The presence of numerous links to potentially harmful sites indicates an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+to+design+a+machine+tool In PDF document text
    • http://redtea.space/hans_zimmer_interstellar_piano_sheet_musiceny4f.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/pGYtBja/4x4_off_road_racing_game_download.pdfIn PDF document text
    • http://8bitbeardsco.com/mizosopuzaliekka.pdfIn PDF document text
    • http://vittorguxx.site/galomiletowakato3otja.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/gdihieF/strength_training_exercises_at_home.pdfIn PDF document text
    • http://wovugikanagak.scienceontheweb.net/angle_of_elevation_and_depression_trig_worksheet.pdfIn PDF document text
    • http://siviveko.getenjoyment.net/average_salary_for_entry_level_business_analyst.pdfIn PDF document text
    • https://cdn.sqhk.co/mivadunoxo/idmBgfk/origami_live_wallpaper_apk_mirror.pdfIn PDF document text
    • http://jisetatiloro.scienceontheweb.net/busikuxafuxez.pdfIn PDF document text
    • https://cdn.sqhk.co/wesaduleb/boQUGl4/grateful_dead_wallpaper_4k.pdfIn PDF document text
    • https://cdn.sqhk.co/tisorobew/hhajeaD/magizoologist_wizards_unite_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/vedimurami/5Ojghfv/how_many_free_kick_goals_ronaldo_has.pdfIn PDF document text
    • https://cdn.sqhk.co/pulazapusaw/ujfjj5n/revolut_business_account_documents.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_7990bd70d62547fc94eaec6dd9ec19da.pdf?index=trueIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_f61c00120ddd45988297d6f2210a53bd.pdf?index=trueIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_4883e331c2e34e8fad93d70ec0c43373.pdf?index=trueIn PDF document text
    • https://c7e723d0-7712-45a3-a8dd-8d8935e7c5e2.filesusr.com/ugd/c4f451_45a6bc3c148d40aea481e29e6ddaa4a3.pdf?index=trueIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_52fe2bb7f2f14d2e8fa6c36cd05a08d9.pdf?index=trueIn PDF document text
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_9e16468a13444a86a54aaf32df480e06.pdf?index=trueIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_c08ab551d15b431ea9ecf1525902dd41.pdf?index=trueIn 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_off0000e431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE431 5308 bytes
SHA-256: 4be9e00b20d250e003403ad64e09e81296f874adf567db0d4782d057c6bc8df2
font_01_sfnt_off0000f62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62B 11280 bytes
SHA-256: fff96a54caa134131d3bfeda0d9b0c6541823920a2611cad6f37c95a32b1dcb6