Malicious PDF — malware analysis report

Static analysis result for SHA-256 f075dd58b91c1900…

MALICIOUS

PDF

69.6 KB Created: 2021-02-26 03:15:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 6520b6ff7b80900871bd5e27607ee8d7 SHA-1: c731c981a3a95ee048d6dc75e860a693ad242577 SHA-256: f075dd58b91c190047acfcdca195edf817dbffc3e2c5d350e68a70e4829f2969
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'crophysi.ru'. The document body, though heavily obfuscated, appears to reference a 'parts manual' to disguise the malicious intent. The ML classifier and ClamAV detection further support the malicious nature of this PDF, likely used as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/award?keyword=2004+polaris+sportsman+400+parts+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_60330192bbde9.pdfIn PDF document text
    • http://choosemadam.site/a_level_english_literature_book1fgro.pdfIn PDF document text
    • http://liko-sneakers.com/15532912412rm9n5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410004/normal_600a43d0052e5.pdfIn PDF document text
    • http://fresh-ita.fun/2008_jeep_wrangler_parts_manual1da1v.pdfIn PDF document text
    • http://creditscoretracking.info/jakiw0vpup.pdfIn PDF document text
    • http://8bitbeardsco.com/o_alienista_caleb_carr54l7n.pdfIn PDF document text
    • http://shopee24.site/followers_up_mod_apk1pf80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412778/normal_600e90f12a639.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466411/normal_60256db8d3dce.pdfIn PDF document text
    • http://bestgirl69.com/975058614534qyx2.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://s3.amazonaws.com/tudawufed/cambridge_ielts_8_reading_test_3_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/3578898481.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/3140273871.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/6711791805.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/ftd_9300_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/gusinivid.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/pokemon_battle_frontier_gba_file.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/fekimupizujiparidej.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/41371552651.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/53852575437.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/advantages_of_learner_centred_approach.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_off0000c686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC686 4996 bytes
SHA-256: 080ef8580bb9ee9d03dda98bfb9516234abb042ad2ccd42cf6d0d20d07c8731d
font_01_sfnt_off0000d74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74C 10424 bytes
SHA-256: 5d607bb55e788ce196f0ebc6bcd428d0c0fc23df9a1d8b14e6fd38e5be2289cf
font_02_sfnt_off0000fa60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA60 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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