Malicious PDF — malware analysis report

Static analysis result for SHA-256 813f12ef46f5fe22…

MALICIOUS

PDF

81.7 KB Created: 2021-03-13 19:23:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ae8de0e677c4216c515093baf1e5c61 SHA-1: 5f6a39569307645a1c0f733bb25da888f9f0ab87 SHA-256: 813f12ef46f5fe22d395e4468516ada7c3c2f563dde3db138c480bf82db7936e
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded URL points to a resource that appears to be a lure for downloading further malicious content, disguised as educational material. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead the user to a malicious download, likely leveraging a PDF exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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://zajinet.ru/award?keyword=ms+excel+2020+assignments+for+students+pdf
    • https://cdn.sqhk.co/jiwosowo/jcggjen/rpg_soundscape_mixer.pdf
    • https://static.s123-cdn-static.com/uploads/4383702/normal_5ff47269c92f2.pdf
    • http://fimewovoko.getenjoyment.net/7054859928.pdf
    • http://zatizoxitosake.22web.org/nowetob.pdf
    • http://jizerigozigalav.getenjoyment.net/what_words_rhyme_with_50.pdf
    • https://cdn.sqhk.co/purorenutuw/4ic9idt/7256668917.pdf
    • http://zojulosopejozaz.iblogger.org/bigg_boss_telugu_tv_show_song.pdf
    • https://cdn.sqhk.co/petawelesup/aRiis8l/wallpaper_tumblr_cute_puppy.pdf
    • http://tasiperop.medianewsonline.com/mexunademigurejufaxelotiv.pdf
    • https://cdn-cms.f-static.net/uploads/4458148/normal_6030773bb82a7.pdf
    • http://vexetifiridik.mypressonline.com/89304106703.pdf
    • https://cdn-cms.f-static.net/uploads/4465691/normal_60175c6a1f223.pdf
    • http://gijofabenetawix.66ghz.com/96439979192.pdf
    • http://bulibujirifubof.scienceontheweb.net/wisatigarisesedubi.pdf
    • https://cdn.sqhk.co/maxevurux/YIHoqi4/vuwilenajiwumabuzukuzot.pdf
    • https://cdn.sqhk.co/vipikunowi/difjahe/hot_springs_story_mod_apk_unlimited_money.pdf
    • http://rexonina.medianewsonline.com/98876097180.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://lubuzasoxevixan.epizy.com/80067052960.pdf
    • http://rixibedi.onlinewebshop.net/biwefinezizefulofal.pdf
    • https://uploads.strikinglycdn.com/files/298576f8-f3bc-42b9-8f63-6b12d63019b8/what_is_the_best_dog_shampoo_at_walmart.pdf
    • http://godutiliwaganos.rf.gd/how_to_eclipse_for_selenium_webdriver.pdf
    • https://uploads.strikinglycdn.com/files/1d1a6374-c4c5-4e62-bca5-26a389e04b6c/para_que_sirve_la_vitamina_d3_50_mcg_2000_iu.pdf
    • http://gajutar.onlinewebshop.net/levit.pdf
    • https://uploads.strikinglycdn.com/files/d2b65ba2-345a-4d57-9cf3-d826b6ec9137/how_to_reboot_samsung_tablet_in_safe_mode.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f099.bin
e0179a203a60b1c93e6d0ef83400f5990073d652b564e8474db22fc5c4748377		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 5704 bytes
font_01_sfnt_off000103f8.bin
0d7aaf775ca463eb3853b67b460208f139c3970561fb245392a3612f25a0efbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103F8 10956 bytes
font_02_sfnt_off0001295b.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1295B 4324 bytes

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