Malicious PDF — malware analysis report

Static analysis result for SHA-256 db33bb41ab230cca…

MALICIOUS

PDF

93.8 KB Created: 2020-11-23 14:24:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: da3b9763beea9df77713d14945d5b223 SHA-1: e09897817778a6354ff68117f80ca5c5eeb00195 SHA-256: db33bb41ab230cca40880d2546e96e4e26ba7a22d30f58c09654f5cd49e188f6
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded URLs, with at least two identified as malicious redirectors. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly indicate that this document is designed to lead users to harmful sites. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://ggtraff.ru/123?utm_term=common+sense+book+pdf In PDF document text
    • https://ruwalabipuges.weebly.com/uploads/1/3/4/4/134465281/guwirafu.pdfIn PDF document text
    • https://voperupazekeko.weebly.com/uploads/1/3/4/5/134505312/letoguverag.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/lanubili/76401730142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ac3e38e-88dd-4f10-8650-61c042c3177c/41989469083.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/dividing_decimals_worksheets_for_5th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/32464423120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/760f72c3-df43-40a0-9f62-e0815848c208/12600262733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9212d781-2f14-4894-bccb-8f0edad54593/gems_activity_tracker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21b88f3f-fde9-4d47-bbc8-13177be71fee/ribavaguzunajuwes.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/autobiographies_of_famous_indian_personalities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a95afc98-504e-434f-b6eb-d6549aacadc5/4976870197.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/tilubilin.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/rofunijokitef.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001419b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1419B 23012 bytes
SHA-256: f73055bc3bfa721092b5db8ca3b50d2594e28b4efeb70ee9cfb3692d961d2984
font_00_sfnt_off0001099e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099E 4960 bytes
SHA-256: 19c2dfd8c5179d76427d8124cbc93ff9ba4de24f1258ff338ee48858adf9bc32
font_01_sfnt_off00011a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6C 11568 bytes
SHA-256: 28098b176e2adbc5f27380989a6622f5bab8726f2fa63d1f375662dfafe83025

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