Malicious PDF — malware analysis report

Static analysis result for SHA-256 045df5ec470a08c9…

MALICIOUS

PDF

117.9 KB Created: 2021-03-05 17:54:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 011c9a63dfdbe5bb6840e5907701ec47 SHA-1: cfa7bd39ed4a549fe062458de30c0683d9f44b51 SHA-256: 045df5ec470a08c9b7e024ae410cab714360a1ba851f43c86b7d5c949c32f1fc
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to educational materials, which is a common tactic for phishing or malware delivery. The presence of external URIs and link farm characteristics indicates an attempt to redirect users to potentially harmful sites.

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
  • 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://botokaw.ru/wix?keyword=unit+vi+worksheet+3+projectile+motion+problems+answers PDF link annotation
    • http://mikovil.mywebcommunity.org/lg_inverter_direct_drive_washer_not_cleaning_clothes.pdfIn PDF document text
    • http://tuwukadinem.mygamesonline.org/best_photoshop_tutorials_youtube.pdfIn PDF document text
    • http://monoga.space/how_do_you_convert_a_crib_to_a_toddler_bed1wa5s.pdfIn PDF document text
    • http://digitalmicroteter.xyz/92607592567wm17v.pdfIn PDF document text
    • http://gepokupaburorew.mywebcommunity.org/how_to_find_reaction_time_physics.pdfIn PDF document text
    • https://cdn.sqhk.co/nadetajagupe/QjgJgeQ/pavofofudukabade.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/jfjgpie/bad_banks_netflix_english.pdfIn PDF document text
    • http://pressit.space/uni-_t_ut61ex2akg.pdfIn PDF document text
    • https://cdn.sqhk.co/visukodo/Shc6eZH/diy_mask_holder_lanyard.pdfIn PDF document text
    • https://cdn.sqhk.co/wusezofetib/pjchiAe/cut_the_rope_2_apk_download_uptodown.pdfIn PDF document text
    • http://maslovauto.ru/nedatupasoluluropukivywej5.pdfIn PDF document text
    • http://josumewemuzob.getenjoyment.net/77440608316.pdfIn PDF document text
    • http://gouliwer.online/612405850839yaes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_77802c61395a4747b13a15645c045fc5.pdf?index=trueIn PDF document text
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_9dcf5dfb4d32485db1697362f69a0126.pdf?index=trueIn PDF document text
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_0bf93c08a43d4b9bb287dddc38afbc3a.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_cb18fc59f9144a058d41cc03481feadc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/376ab30d-7d12-40cc-9450-6fb5e690c92f/santa_clara_unified_school_district_classified_salary_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab40b9d1-a002-4d6f-a96a-dcce67752111/sharp_clock_manual.pdfIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_26ad7e19964f4b7a8cd022abd6d7a473.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_off0001942f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1942F 5760 bytes
SHA-256: 7273eb4d2af59a03204533fa0952629976d5fd7eb38e036703d76510b5f75472
font_01_sfnt_off0001a7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7B4 9940 bytes
SHA-256: 5fbb96f922b5c99d03e84a0a2697c2d4477fa54caf6b57f67d6c9c88e4c33587

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