Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d7d0806e531dba…

MALICIOUS

PDF

78.9 KB Created: 2021-03-19 12:13:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 75846a75783bf3bbd46c4e6868cc49d1 SHA-1: 4ccf42db4f70164848a25c2b58131740d9588f57 SHA-256: 82d7d0806e531dba0f49a4d8a8eb1124a743df746bb2bd05ed60fa98f4bc1c26
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The primary malicious URL identified is 'https://kuzutuzo.ru/strik?utm_term=what+score+do+you+need+to+pass+road+test'. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the ML classifier's high confidence score support the assessment of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=what+score+do+you+need+to+pass+road+test PDF link annotation
    • https://babixugopanodip.weebly.com/uploads/1/3/5/3/135382952/zubedegovapiwitaza.pdfIn PDF document text
    • https://gupufema.weebly.com/uploads/1/3/4/4/134456882/zevowivi.pdfIn PDF document text
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/lajiziw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_97cd04d4c07544729df2791430962633.pdf?index=trueIn PDF document text
    • https://ddd90330-5837-4e0c-b2f6-9383941cd2db.filesusr.com/ugd/568e2c_80fb9da2296d4f10929239d3e4f49c51.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lebejos/android_adapter_get_parent_view.pdfIn PDF document text
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_587b3ef421d440fe939707df7482242f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zidenigad/vurew.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/harbor_breeze_ceiling_fan_user_manual.pdfIn PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_2c142f3a55d64203825c01d5543346cb.pdf?index=trueIn PDF document text
    • https://510b81f6-be4e-4e40-9acf-3f60af495837.filesusr.com/ugd/5f226b_9689b4d4106849f9af128823f0897549.pdf?index=trueIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_968992b8be034b61ba8d6f3adfdfe5bc.pdf?index=trueIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_9358a64f1efc46c2a85e075568fc0902.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/chefs_choice_knife_sharpener_4643_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/clifford_the_big_red_dog_book_series.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/sims_4_realm_of_magic_potions_guide.pdfIn PDF document text
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_eb2892a644b44604a2144de79840af7f.pdf?index=trueIn PDF document text
    • https://976edc35-935c-46de-9e6e-e225dbc25668.filesusr.com/ugd/0829d8_293d1ddee0c545729c9e70fd2baf7a01.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/how_to_set_wild_game_camera.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 5080 bytes
SHA-256: e49e826a2b8d729d1a416d36286d1fcf1ac77603021a27b83a640a62700124c5
font_01_sfnt_off0000fafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFE 10960 bytes
SHA-256: 49a2d1fa6a02f24c49f509306f928f3d3ccb4cfdc144ea368e86ee5c4e310f76
font_02_sfnt_off00012038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12038 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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