Malicious PDF — malware analysis report

Static analysis result for SHA-256 87cf6f1615bc3446…

MALICIOUS

PDF

107.4 KB Created: 2021-04-01 08:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1eaf68fbddd7d4fc059dc86b7bb6a970 SHA-1: 22af5ee552888fcd4ee2105f5c79f101b5e716d6 SHA-256: 87cf6f1615bc3446947a7cddc1652fa987110ffb58a7d542861cdfb504101857
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, and contains a high number of embedded URLs. One critical heuristic identified links to known malicious redirector infrastructure, and another indicated a link farm. The document body appears to be obfuscated or corrupted, but the presence of numerous external links suggests a phishing or spamming attempt to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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.
  • 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://dafemum.ru/strik?utm_term=what+are+the+names+of+the+27+books+of+the+new+testament In PDF document text
    • https://cdn.sqhk.co/tinodifozeza/xhbgeha/video_status_maker_app_mod_apk.pdfIn PDF document text
    • http://vaxunugaso.22web.org/79090627519.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/jFBGX7M/funny_road_rage_videos_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/neviragar/ugjAmig/82840779238.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368953/normal_6023d3f3a8873.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393521/normal_5fc76375a2215.pdfIn PDF document text
    • http://rubivof.22web.org/jefaxuvidu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371814/normal_6022556e9f5a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370063/normal_6025056dc6e2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455197/normal_6051e06a7b4af.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/vavabi/hunchback_of_notre_dame_cast_2021.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/13797925254.pdfIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/the_art_of_racing_in_the_rain_full_movie_stream.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/verudusazabo.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/xojowodila.pdfIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_0e24c54927c946d98e2aa5d117f50f6a.pdf?index=trueIn PDF document text
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_df31d2944613469aa6be70f31924087a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/wigejopuravilarolipamijek.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001333a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333A 5496 bytes
SHA-256: f6309a3b35be0131cac56526a4f659db3eb6cbcd6cb08ba3f2920b5790b85782
font_01_sfnt_off000145d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D9 3456 bytes
SHA-256: 65cf8c2d86a9e85c706668e7b0b646aef61ff9c6923f9c12b213f7e6eb7b8e02
font_02_sfnt_off000153ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153BA 22732 bytes
SHA-256: ecb4caaeef22fb5b409e87a1cb62af3513de221f6b3ca91a9368e19eb920a11b
font_03_sfnt_off00018877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18877 16060 bytes
SHA-256: d78d7cc1a68daa951b4fbccbcfb906d5a08ad384f187125596154666a45abe72

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