Malicious PDF — malware analysis report

Static analysis result for SHA-256 618da1cee74e9977…

MALICIOUS

PDF

75.7 KB Created: 2021-02-20 18:40:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 00227c61d42470a17b4ca8f9b1acb906 SHA-1: e17e8dcc6e6ed9fbb394cb0ec801e1eea9ddc939 SHA-256: 618da1cee74e9977b9da3995c48ac926fc159eefc78ea540a8c5ab325385d891
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, potentially a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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/wb?keyword=why%20we%20should%20not%20wash%20clothes%20on%20thursday In PDF document text
    • https://cdn.sqhk.co/vekuperik/YjiF6hj/45529715707.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480173/normal_5fe43d67dd034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371261/normal_5fd95eb918189.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/yJibjfz/evil_nun_scary_horror_game_adventure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491153/normal_600e510be8326.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/eXqLgcR/nhl_standings_espn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427086/normal_5fdac296c3417.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447096/normal_602683b9ced5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375093/normal_60311ce5bffff.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/ibkzjf0/mod_among_us_skins_for_minecraft_java_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/iigfyIT/59057690026.pdfIn PDF document text
    • http://smartcoin.design/gajadivatoxudegejorikilmiupd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479236/normal_5ffcdba1ca850.pdfIn PDF document text
    • https://cdn.sqhk.co/zumedizojas/bbhgeAk/schleich_farm_world_pferdestall_42485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379038/normal_5fda4b27708f0.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
    • http://fedorahosted.org/lohitIn PDF document text
    • http://liwobeve.rf.gd/sobutopejotufofifew.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5A 5068 bytes
SHA-256: 1729a75e7debecee73724128b13c0c3571e6241a1d131dafa911a8af618f2e16
font_01_sfnt_off0000e09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09F 9924 bytes
SHA-256: 40cf72f1c79fa643dbd0e7e72098b1f104d58df522311a88058a8ab9e380dcf2
font_02_sfnt_off00010297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10297 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
font_03_sfnt_off00011098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11098 4464 bytes
SHA-256: e20259a70002e8e810c491d3190d7fc0dffcd2ce423647295cc26d5313b09edc

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