Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6437a15cbbb0ee…

MALICIOUS

PDF

79.4 KB Created: 2021-03-24 01:02:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb227ca4fbd01084436b74d3d4ccab92 SHA-1: 7a859518ac7fa2b38f7049905aecbec705be4ca6 SHA-256: 5a6437a15cbbb0ee0e4a78af7a5af63ab4854941a60ea5d444d4605d28e6f085
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URI pointing to a suspicious domain, likely intended to host a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to English grammar exercises.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=basic+english+grammar+exercises+for+beginners
    • https://cdn-cms.f-static.net/uploads/4377933/normal_604297234a9d2.pdf
    • https://cdn.sqhk.co/virurewev/SeVheia/bunk_bed_with_slide_buy.pdf
    • https://cdn-cms.f-static.net/uploads/4495691/normal_600fd5c17ff51.pdf
    • https://static.s123-cdn-static.com/uploads/4482863/normal_5ff412a8dc1d7.pdf
    • https://cdn.sqhk.co/gosukutusu/whMERjb/zabanuwotarokifonixurozi.pdf
    • https://cdn.sqhk.co/jupujezaxa/KTjfihS/ghana_education_service_syllabus_for_jhs.pdf
    • https://cdn.sqhk.co/rojarimeg/Zid7iih/degowukapimimikisododimu.pdf
    • https://cdn.sqhk.co/veladaxuzeba/YLlGhbT/bosimolovoduzuwupo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/50b05a8b-7705-454c-a4f4-682d6da30c5f/lenovo_g50-80_dolby_driver_windows_10.pdf
    • https://s3.amazonaws.com/luramamelolem/hush_little_baby_lyrics_modern.pdf
    • https://uploads.strikinglycdn.com/files/0e723ef9-190d-4610-9dbc-692b1a03f657/zixumuxudez.pdf
    • https://uploads.strikinglycdn.com/files/5be05f9c-e375-482e-a06c-c2f5e68cbffc/what_movie_plays_its_the_end_of_the_world_as_we_know_it.pdf
    • https://s3.amazonaws.com/lemerisinivum/ekornes_stressless_review.pdf
    • https://9c3086b9-336b-4a4d-b39c-975a2563a2e0.filesusr.com/ugd/f4f792_e05ca61c23f44ce5bcd94389de98f35b.pdf?index=true
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_96f79048692f46769cd51eb49494ad35.pdf?index=true
    • https://s3.amazonaws.com/tumuzu/85887041439.pdf
    • https://s3.amazonaws.com/gomaxod/821459618.pdf
    • https://uploads.strikinglycdn.com/files/c9fc4ddd-e3d5-43ce-845f-881c2f230289/mtd_chipper_shredder_5hp_manual.pdf
    • https://s3.amazonaws.com/jitimesolagun/85268628645.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d781.bin
c9505e12e9005038f657ac6e239ffc434efdee6813fd4676cd0b40901d2dfbac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD781 5552 bytes
font_01_sfnt_off0000ea3a.bin
2efce7ab7e40088d636505c3bfb509387c7acf8cfb7972371bfedf85748c46cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3A 1832 bytes
font_02_sfnt_off0000f319.bin
b2a5b8642f18c59edb980ed9572a08939d5817c61ff8ff1b7901796cab82e8e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF319 11092 bytes
font_03_sfnt_off00011918.bin
c27f923d842fcf75914bcb38f910c7ee9e5e847eea41e4b8197fd3b1a7c12a35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11918 16508 bytes

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