Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce728bd3b77002a…

MALICIOUS

PDF

82.6 KB Created: 2021-04-02 16:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85f69b075c71ec5fb2990ec03c7c5684 SHA-1: 8468fc4d5ea83ed3e2c21d8d1f1d4552b2610b41 SHA-256: 7ce728bd3b77002a109e2d4bdca34d75425819880cc0071b2ecafb174536f9ec
96 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains embedded URLs, some of which are flagged as unknown or potentially malicious, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure disguised as a lesson plan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cdn.sqhk.co/fijufupuga/h37ghjh/13718474070.pdf
    • https://cdn.sqhk.co/mudonisogub/e0gijel/f1_gp_standings_2016.pdf
    • https://cdn.sqhk.co/rufebumu/5iehihb/52626648576.pdf
    • http://wudazex.sportsontheweb.net/java_basic_programs_with_explanation.pdf
    • http://gutoguzo.iblogger.org/timex_ironman_classic_50_full-size_watch_band.pdf
    • http://dejepuzalew.mygamesonline.org/10725282851.pdf
    • http://panikovo.iblogger.org/pet_sematary_cat_2019.pdf
    • https://cdn.sqhk.co/sovokeduseb/6LM5Kjh/40034611360.pdf
    • http://xanuxitawunavi.iblogger.org/gawetuxetim.pdf
    • http://nefozufovi.scienceontheweb.net/32574240101.pdf
    • http://ziwusis.getenjoyment.net/what_is_gonga.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://feedproxy.google.com/~r/wb/ENAH/~3/n4t4wXRn-MA/wb?keyword=narrative%20writing%20for%204th%20grade%20lesson%20plan
    • http://somutirawil.epizy.com/bow_and_arrow_games_for_android_free.pdf
    • http://patikogoxuxit.epizy.com/befikuz.pdf
    • http://fajazimigig.atwebpages.com/78313166627.pdf
    • http://zoloxufiz.epizy.com/benedetta_follia_film.pdf
    • http://zoratamit.epizy.com/why_is_my_night_owl_offline.pdf
    • http://jozizirepimetel.rf.gd/27593355068.pdf
    • http://robelonazolabo.epizy.com/92017233663.pdf
    • https://s3.amazonaws.com/lixuzo/esl_creative_writing_worksheets.pdf
    • http://nadiripu.epizy.com/vba_excel_2018.pdf
    • https://s3.amazonaws.com/saxefi/tom_clancys_jack_ryan_season_2_episode_8_wiki.pdf
    • https://s3.amazonaws.com/xezonijida/86480972469.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_off0000f787.bin
3dbe3ec465a0006216f94ddee1371bd2a810946b381a13ef21e90615e063593c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF787 5300 bytes
font_01_sfnt_off000109a7.bin
601cb9662105d05f4ba6f60f40839211e1bde51f68d6df7ecfd5b8089e1700b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x109A7 10844 bytes
font_02_sfnt_off00012e8e.bin
ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8E 4324 bytes