Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2fba52c83918d6…

MALICIOUS

PDF

82.5 KB Created: 2021-03-23 23:20:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1e6392ae8617602c17bb85ae5fb993d SHA-1: 24e832aecf566b03af84063ef4a08a728987c726 SHA-256: 7f2fba52c83918d67b56a963ce081141ebe8b840672e16b41efc01d25082e818
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a mass external link farm, with one prominent URL being https://nipisod.ru/123?utm_term=fortnine+helmet+guide, likely intended to redirect users to malicious content. The document body, though heavily obfuscated, suggests a lure related to a "Fortnine helmet guide". No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/123?utm_term=fortnine+helmet+guide
    • https://cdn-cms.f-static.net/uploads/4388827/normal_60226989ea357.pdf
    • https://cdn.sqhk.co/xobitabab/VKijII9/my_success_story_business_game_hacked_apk.pdf
    • https://cdn.sqhk.co/ketofebem/gf5RHij/qr_code_scanner_for_windows_10_free_download.pdf
    • https://cdn.sqhk.co/noneniwetav/EhfEhaV/kannada_melody_songs_album_free.pdf
    • https://static.s123-cdn-static.com/uploads/4412174/normal_5ffb3897d4acd.pdf
    • https://cdn-cms.f-static.net/uploads/4497358/normal_5fd5f81634530.pdf
    • https://cdn.sqhk.co/mareduviger/eSNuUib/cowboy_game_today_score.pdf
    • https://cdn-cms.f-static.net/uploads/4413846/normal_605128c42d753.pdf
    • https://static.s123-cdn-static.com/uploads/4490757/normal_5fee83789a57e.pdf
    • https://cdn-cms.f-static.net/uploads/4457320/normal_60436dc255435.pdf
    • https://cdn.sqhk.co/malasexek/iaiiJhc/occupational_health_nurse_practitioner_salary.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c4a0f302-b060-43a0-af10-a0364da5eca7.filesusr.com/ugd/c6d327_1844cf1f3ee34c73b393556304a1908c.pdf?index=true
    • https://7b9449e5-51e9-4a7e-81f5-8587c42320f9.filesusr.com/ugd/571bad_2224d79b92114c67b8e52369df5a59cb.pdf?index=true
    • https://f4a80ce2-0a24-44e2-aff7-13c87a434ee9.filesusr.com/ugd/ace063_cdd34cc6c4974edaa4ab30325ea6634f.pdf?index=true
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_c5ecd1a47ba048cca3f7fc0124ffc7fb.pdf?index=true
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_f0c13bd5fce14aadb5d9adbbfb898835.pdf?index=true
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_85a31aa63d27443a9c5b9c9b4bdb38ed.pdf?index=true
    • https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_4f2bc7ae255947ada8ab54c5ec7f8c42.pdf?index=true
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_3700a91f43d0434d971773ffd138fe95.pdf?index=true
    • https://0b7b936c-93ac-4a60-9644-6ba220b934cc.filesusr.com/ugd/b4bf80_204ed1d78e674bfda403dfa1222511b8.pdf?index=true
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_e1c448683b1d4702ad96b11d5930891d.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107c6.bin
8c0711d96787b811485add323e861f42bc7a0e4b6a8a2abfd39ca40b3bd83b14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107C6 4808 bytes
font_01_sfnt_off000117f8.bin
236cdf25c0029255932d7c8e7c51a23f8e55e7b46dde4978d4d887fbda711362		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117F8 10864 bytes

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