Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7c6940f7811b52…

MALICIOUS

PDF

77.3 KB Created: 2021-03-20 05:13:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e06da8e300ff727ce1829a2a4202529d SHA-1: bb69832c2112ad99794642277091b36cf15280cd SHA-256: 1c7c6940f7811b522da7db4bd85bcad712bf8eb1b2b4524db46ceabd179cc006
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URL pointing to a suspicious domain, suggesting it's part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, hints at a lure related to 'year 6 math worksheets pdf', which is a common tactic to entice users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soxebez.ru/award?keyword=year+6+math+worksheets+pdf
    • https://cdn.sqhk.co/gixotagokezu/EhiWHie/38318935176.pdf
    • https://cdn.sqhk.co/dopebuxoz/cfjjMgd/28600357419.pdf
    • http://white-x.fun/en_una_tempestad_analisisxtsow.pdf
    • https://cdn.sqhk.co/wafozozutit/dhcjigg/2nd_grade_activity_worksheets.pdf
    • https://cdn-cms.f-static.net/uploads/4450728/normal_60357b1c6d981.pdf
    • https://cdn.sqhk.co/pazoxini/heM1H8t/aacs_decoding_library_vlc.pdf
    • https://cdn-cms.f-static.net/uploads/4411926/normal_6029ef49d1f24.pdf
    • https://cdn-cms.f-static.net/uploads/4457862/normal_6051bbfd4e71e.pdf
    • http://beststudent.space/thin_aluminium_sheet_bunningsyju5c.pdf
    • https://cdn-cms.f-static.net/uploads/4420224/normal_5fd309fbd7428.pdf
    • https://cdn.sqhk.co/sezelijimofi/gcgdjiw/army_helicopter_games_unblocked.pdf
    • https://static.s123-cdn-static.com/uploads/4374024/normal_5fcb6001b85b2.pdf
    • https://cdn.sqhk.co/kixagixupo/1D5jfhb/guwevexuzikulumatodu.pdf
    • http://ig-socialmedia.xyz/pixevonayzs8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b392497a-00a6-487e-9a45-ebe782741c9b/xufutuputekusidanifilos.pdf
    • https://uploads.strikinglycdn.com/files/58c08135-e9b3-4719-8f75-970766a81173/what_was_cains_occupation_in_the_bible.pdf
    • https://uploads.strikinglycdn.com/files/aa004329-63e7-4794-951a-638049cc4c78/black_box_g1w_dash_cam.pdf
    • https://uploads.strikinglycdn.com/files/b3a9b93e-cb92-4a5f-b69e-6b633c83e8ec/80092965780.pdf
    • https://uploads.strikinglycdn.com/files/a06dc294-f646-46e6-8baf-3ec6681fafe0/26_roadmaster_granite_peak_womens_bike_weight_limit.pdf
    • https://uploads.strikinglycdn.com/files/c676d93e-ef47-47d7-9540-ddae95c02268/24314342918.pdf
    • https://uploads.strikinglycdn.com/files/ad5115b9-a488-43cf-9e6c-45487fd30406/61314752374.pdf
    • https://uploads.strikinglycdn.com/files/ad5c7e34-cd00-4494-b956-6d30abff040b/bach_cello_suite_1_prelude.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_off0000f07d.bin
c2cbc94082069367346f9fed9b82b9eafd39eaeda71688ad4eda5eb02418471c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF07D 5520 bytes
font_01_sfnt_off0001032e.bin
6a4e9b6785efcffaf9bdc81ff9e26e80146133049531c6a8c2586d9f93627638		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 10636 bytes

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