Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4101605cfa4ee45…

MALICIOUS

PDF

70.2 KB Created: 2021-03-06 21:44:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 11ea4b405980b6b1578b5b094f147456 SHA-1: 20ba45d9bb6cacc25bb2917ad66b1d5ba9584ddb SHA-256: a4101605cfa4ee4534b06388d51652df2c1c2c7ee158bb73fe871ccaa7f80828
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to 30 external PDFs. The embedded URL 'https://baarspo.ru/wix?keyword=evolution+test+review+worksheet+answers' suggests a phishing or malicious redirection attempt. ClamAV detection and ML classification further indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://baarspo.ru/wix?keyword=evolution+test+review+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/pogezasamu/jhjf0hj/nugezuzase.pdfIn PDF document text
    • https://cdn.sqhk.co/lepudijazur/jgZyZyj/3144660085.pdfIn PDF document text
    • https://bexoxofimimiwox.weebly.com/uploads/1/3/0/7/130775405/fozopemasepaxox.pdfIn PDF document text
    • https://ronenajawewaxiw.weebly.com/uploads/1/3/4/5/134594127/2b773d73dd2ab.pdfIn PDF document text
    • https://cdn.sqhk.co/pemejurove/Cgc5ZHl/auction_apps_for_cars.pdfIn PDF document text
    • https://kolijegidixut.weebly.com/uploads/1/3/1/3/131379325/31848a.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/QjiIHyn/money_spent_by_lobbyists.pdfIn PDF document text
    • https://kobuzonoge.weebly.com/uploads/1/3/1/4/131452837/156653.pdfIn PDF document text
    • https://cdn.sqhk.co/pumevigatare/aAidnja/zevezisuxalebudi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/zugowabopudutonamofup.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/mini_dvi_to_mini_displayport_adapter.pdfIn PDF document text
    • https://2cc12256-1025-444a-bacb-901a9f007bda.filesusr.com/ugd/d1fcfc_ca844f7c8c9342feb1cb2505eb26f239.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/petikamov/kalimba_sheet_music_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/026ac227-5877-4ffa-a4a9-381a23d42a57/ledatidizuxelupiges.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/29263825446.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca4a1d49-1bef-4737-a062-8aa78f12aa75/healthy_indian_recipe_books.pdfIn PDF document text
    • https://2d841ef3-a248-4e6a-996b-2d54d6713fdd.filesusr.com/ugd/1decf9_3ee76ae6b59342cfae8e1a21114d7fe0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/microsoft_intune_guided_access_app_unavailable.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/balochistan_board_9th_date_sheet_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/bb_9900_os.pdfIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_634d1cdfc2bc4a1e83321321fe8dbc6a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vunizi/25473650107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e177ce10-1605-4532-a47e-8a18431f5031/mitimaxulatiduvegu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD613 4948 bytes
SHA-256: 65df4a96e183307629f42f7499bb0c9e2135dccdf46dce534ae7ca20affdb2fc
font_01_sfnt_off0000e6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F6 10704 bytes
SHA-256: db2394de6b440caf0ad400809a4c7d2e53f2aed601079a4d5afb24dc3c46c3f1

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