Malicious PDF — malware analysis report

Static analysis result for SHA-256 033349395180b50c…

MALICIOUS

PDF

74.0 KB Created: 2021-02-25 22:00:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 0f10866d6ad4c73f056ef0bb00ffd359 SHA-1: 9dc2025a7bb754b6ed958f6d90538747490cc299 SHA-256: 033349395180b50c86fc88340740f6083115b357d57e0a5b39f060b7d07198ea
162 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'. This URL is presented in the context of a 'how to fill self declaration form', suggesting a phishing or scam lure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL within a document that exhibits characteristics of a lure strongly indicates a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/strik?utm_term=how+to+fill+self+declaration+form In PDF document text
    • https://cdn.sqhk.co/monasomeb/9OhicVQ/game_center_cx_ds.pdfIn PDF document text
    • http://fagumawegoleleb.mypressonline.com/niv_bible_gateway.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/ghhggOY/sanujipukezilotuvexot.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/vuterijoze/soundcloud_musik_en_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/teachers_pay_teachers_math_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/gusule/conair_compact_fabric_steamer_directions.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/14825944843.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/perimortem_cesarean_section_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/amazon_cloudwatch_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/4802760170.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/kuberanelifewuseposazini.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/fb_video_iphone_app.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/bipoweralopesuv.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/67195646513.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_off0000d77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77C 5008 bytes
SHA-256: f8af1c9aeae2ee4f73780b086948d3890dbfa2a26c85326f73b57d870929927f
font_01_sfnt_off0000e86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86D 10824 bytes
SHA-256: d39bced34afe6c876b41b77238441201baf9323aa9ccffeedbc090dd6ea4fc27
font_02_sfnt_off00010d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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