Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9599a37181ac93c…

MALICIOUS

PDF

80.6 KB Created: 2020-11-24 23:43:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 02d5fa4aa989478773e23d0d1370d259 SHA-1: 935a3db447cd732e4391bde4c0856edb06e2abfe SHA-256: b9599a37181ac93c7efc5724669b83b44d941adce438fcbb7e824da94915ddc2
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 links, with at least one pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to host these links.

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://gettraff.ru/123?utm_term=population+ecology+crossword+puzzle+answers In PDF document text
    • https://bojifigo.weebly.com/uploads/1/3/4/8/134847606/jokimeregimuruximu.pdfIn PDF document text
    • https://gumomamomav.weebly.com/uploads/1/3/1/3/131398069/f6e13c0e3f039.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393488/normal_5fb2ef07ad996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377905/normal_5f8ce7128d15d.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/jusuberu/simple_commercial_lease_agreement_template_ireland.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/recycling_codes_3_and_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e797643c-74c5-4a45-9029-58196b9a76cc/ford_5000_shop_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/dubuxurizebinuwoxanowel.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/negunenenowazobuv.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/51697766994.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/constitution_and_bylaws_of_ssg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ad68319-bfe8-48ba-a366-1102ea39f827/36500632662.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/activity_2.1_1_centroids.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/mikirurosus.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FD 5484 bytes
SHA-256: 4e13c26953bb258acc53bf79338aee83bda25b4c1c574025eec229c2b9f56355
font_01_sfnt_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 12460 bytes
SHA-256: 56cab0f709fa0433f8f6cf464b13aab2f5af9aef2458766b9a30642699798cea
font_02_sfnt_off00012031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12031 16068 bytes
SHA-256: 89247d3646e3773572243f1d4b0449240b5d7bcbc9865045ac28c7845acd9c8f

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