Malicious PDF — malware analysis report

Static analysis result for SHA-256 a181df773ec0f625…

MALICIOUS

PDF

70.5 KB Created: 2021-06-05 05:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b663cea79ba5b1b83aa30b3934b7516 SHA-1: cbf68dccc8ec8545ca84677fb303b40b9f9383a2 SHA-256: a181df773ec0f6257af4547a086ac69a963738418d04d3776f896627a2b4fce9
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating an external URI, which points to a suspicious domain. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a 'physics gizmo answer key', aiming to trick the user into visiting the provided URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/pbw?utm_term=force+and+fan+cart+physics+gizmo+answer+key
    • https://cdn-cms.f-static.net/uploads/4450045/normal_60541b2f98192.pdf
    • https://static.s123-cdn-static.com/uploads/4448339/normal_5fc867c84f504.pdf
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/venisigurusokok_saxuf.pdf
    • https://zebaraxofalolal.weebly.com/uploads/1/3/0/8/130813897/357c89f7497ffe.pdf
    • https://cdn-cms.f-static.net/uploads/4426066/normal_600fdb60263ac.pdf
    • https://roluwisotem.weebly.com/uploads/1/3/4/3/134368144/6f8e3.pdf
    • https://cdn-cms.f-static.net/uploads/4427809/normal_606067df3a555.pdf
    • https://cdn-cms.f-static.net/uploads/4403120/normal_5fda1f827e6da.pdf
    • https://cdn-cms.f-static.net/uploads/4417815/normal_602a086b65815.pdf
    • https://raguloduw.weebly.com/uploads/1/3/4/0/134041620/6dfd5d4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jesababa.pbworks.com/w/file/fetch/144414729/types_of_register_in_english_language.pdf
    • http://paderukut.pbworks.com/w/file/fetch/144444213/51246799311.pdf
    • http://mapijakemifo.pbworks.com/f/didawejajotinub.pdf
    • http://nagaxop.pbworks.com/f/what_does_helen_represent_in_jane_eyre.pdf
    • https://uploads.strikinglycdn.com/files/990144df-888d-41cb-8917-1c6323e110c2/19192399579.pdf
    • https://uploads.strikinglycdn.com/files/4e5955d5-a4eb-4481-be1b-2396fb6f2faf/vebugefupisubo.pdf
    • https://uploads.strikinglycdn.com/files/ee865cb7-752e-4aff-8125-f91f9f3716f9/how_to_fill_up_a_brita_water_bottle.pdf
    • http://mepijewaj.pbworks.com/f/42230658153.pdf
    • https://uploads.strikinglycdn.com/files/7bc00946-3c87-4157-a5d7-eda35fdb4585/trophy_and_cake_emoji_answer.pdf
    • http://saladolu.pbworks.com/f/7.snf_ingilizce_ders_kitab_cevaplar_meb_yaynlar_sayfa_78.pdf
    • http://gatasulupu.pbworks.com/f/saps_psychometric_test_2020_download.pdf
    • http://javefanudosa.pbworks.com/f/larogafoju.pdf
    • http://ziduzobif.pbworks.com/f/what_is_gradable_adjectives.pdf
    • https://uploads.strikinglycdn.com/files/f878f337-7e12-4458-a8ba-d809b905e49a/tawirifidupozopuvewixof.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d47b.bin
3ba2ccf732b1a823ec40cb4022ae60ee48325fb8a21c6e39791d7eaeb373bdcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD47B 5800 bytes
font_01_sfnt_off0000e83c.bin
7b66069be78aaf1123b564b6b978016564672e12c9e80de3e671b3171e9ddda4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE83C 10396 bytes

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