Malicious PDF — malware analysis report

Static analysis result for SHA-256 420b21c58c75e2c0…

MALICIOUS

PDF

143.0 KB Created: 2021-04-01 06:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f6d00a4c51f641ba6ed5933e742cffa SHA-1: 55d6296e86595cec26a289c82b0220d5bcd9361c SHA-256: 420b21c58c75e2c0ae31a401c873c3e18e804322614aa46cd3911ee0dc0a5f6d
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, specifically flagged as Pdf.Phishing.Trojan. The presence of an external URI pointing to 'golowaki.ru' with a keyword suggesting a free download of a physics PDF indicates a likely phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and the nature of the embedded URL suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://golowaki.ru/award?keyword=barron+s+sat+subject+test+physics+pdf+free+download
    • https://cdn.sqhk.co/pawekenu/03iinhg/velodrome_track_bikes_for_sale_uk.pdf
    • https://cdn.sqhk.co/funuwovo/cjgIunk/zozalodezamafawiw.pdf
    • http://sakepugikunon.mypressonline.com/clipsal_trade_catalogue.pdf
    • http://pasikufopubiwo.mypressonline.com/have_tesla_prices_dropped.pdf
    • https://cdn.sqhk.co/nigalasiline/hjbMYjf/13984929127.pdf
    • https://static.s123-cdn-static.com/uploads/4428078/normal_5ff37957dbb52.pdf
    • https://cdn.sqhk.co/nomowaxiwo/eqThbWE/54679721847.pdf
    • http://ritegifufefut.scienceontheweb.net/acl_reconstruction_rehabilitation.pdf
    • https://cdn.sqhk.co/rodoruwuwab/NXPKGjc/26502976932.pdf
    • http://xupokaxe.medianewsonline.com/fogibatumavijozofafa.pdf
    • https://cdn-cms.f-static.net/uploads/4369165/normal_600f785d0ab21.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://aa6eca1a-c690-4a36-985e-a873157a80b3.filesusr.com/ugd/081493_516da8c410b84d86ae3fac4a9ed00174.pdf?index=true
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_4beb91b5e4f14aef9649fb348f9cee1d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e3f04499-add7-4e34-b119-f3ba44add03a/10568140169.pdf
    • https://uploads.strikinglycdn.com/files/65d695bf-ce14-40c7-865e-a9dfafa2a9f5/survival_games_online_free_download.pdf
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_7ebe583667874d93938f009641a923ce.pdf?index=true
    • http://dojorunubi.myartsonline.com/ana_catalina_emmerich_antiguo_testamento.pdf
    • https://uploads.strikinglycdn.com/files/d0d4a545-d329-40a6-b7f6-0720bd98887f/dibs_in_search_of_self.pdf
    • https://uploads.strikinglycdn.com/files/4962fa14-aff9-4160-ae8c-cd94d9981e89/culture_and_values_a_survey_of_the_humanities_8th_edition_download.pdf
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_569ab98f2adf4dedbcad8c7528eda353.pdf?index=true
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_416cb49351df4da1ac13ec6f881da471.pdf?index=true
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_4082f8b77afd491099d8048b07c991ea.pdf?index=true
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_b48e22b094e94f9995e0917266075633.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e2c3e256-4824-4d1a-8c80-7220744354c6/is_dark_souls_remastered_switch_worth_it.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_off0001002c.bin
a0a343200fd6bd77da77d6a47c591209822077988371de77454224fc06173b5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1002C 82432 bytes
font_01_sfnt_off0001f5b0.bin
b81f3865f3ee55e5a09ca7248243d96ad3fa52b65da6a0b9ce2af940569532aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F5B0 5700 bytes
font_02_sfnt_off00020926.bin
bd475c2bd8e6ef80baf30954b6672896b75a284d1dce2f8e5f99a5016cfe6f1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20926 10796 bytes

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