Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9bffa1cf46fe59c…

MALICIOUS

PDF

73.1 KB Created: 2021-01-16 20:29:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d50c72c4a54a55497e0606d3504db755 SHA-1: 0abff52c1a11fb8ecd0184958b01b071e56a01cc SHA-256: b9bffa1cf46fe59c2c1edd569a11ad2bf24023334e8fbf077c259be7a2d286d4
156 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 external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary external URI points to 'https://trafftec.ru/123?utm_term=personality+assessment+inventory+scales', which is likely part of a malicious link farm. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the structure suggests a phishing or SEO abuse attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/123?utm_term=personality+assessment+inventory+scales PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4467005/normal_5fcc463f6c245.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389080/normal_5fa1af8f73d0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470972/normal_5fee9c5f9850d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413866/normal_5f9ba8a386a87.pdfIn PDF document text
    • https://sapixokevabose.weebly.com/uploads/1/3/4/4/134498139/2876236.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381320/normal_5f8b1902c1c63.pdfIn PDF document text
    • https://cdn.sqhk.co/relulapezele/GM0ezif/zombie_craft_survival_3d_pc_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453730/normal_5fae4c5db4876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415073/normal_5fa05f4f13dda.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/kujesulad/20784136510.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/wimowakumejegego.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/gdb_cheat_sheet_linux.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/hungry_shark_world_mod_apk_unlimited_diamond.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE215 5108 bytes
SHA-256: dd9cee39e4d937d3cf244a561d0a15e039810ce5989445151fbc48a7dda73035
font_01_sfnt_off0000f36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36C 10496 bytes
SHA-256: 8ffa6af1abbcef3d3197f19cec8ac81e01d9b894b054dd1de9e565274951e86d

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