Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc3df74ff80069a…

MALICIOUS

PDF

81.7 KB Created: 2020-12-16 23:44:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 31830226b6238db8535f5ae95e5d13ec SHA-1: e1f6f2a0217056940d0f8d619b8947a6d5515f1b SHA-256: 7dc3df74ff80069a5a90a29fe2fbb1086b2eb8974ed0506188cd9ad423ca78dd
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, many of which are disguised as legitimate documents, indicating a link farm or phishing attempt. The primary malicious URL identified is https://traffine.ru/123?utm_term=jesus+calling+devotional+book+pdf, which is likely used to redirect users to a malicious site. The presence of PDF_SEO_LINK_FARM and PDF_URI heuristics, along with the ClamAV detection, strongly suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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://traffine.ru/123?utm_term=jesus+calling+devotional+book+pdf PDF link annotation
    • https://neverazu.weebly.com/uploads/1/3/4/9/134901342/08e66.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ccb1d78-f662-4854-8251-38d853d133ec/1613505372.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7828bd8e4f44799675b34/t/5fca4913fedaa13a486f0caa/1607092508875/64484160380.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/mudogubuloso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75f5089e-7770-483b-98c6-1c649ab82ebc/50482055004.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/24914203941.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/hypertension_guideline_2019_thai.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23b796a9-6466-44f4-909a-d7a57b91a7b0/takutonevosavisavexoba.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/archery_mod_apk_unlimited.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/26214740856.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 6444 bytes
SHA-256: e8ac5c97b4222b14b05c49468aae435eab6d01b1b1e1bcea31f810b253a4c327
font_01_sfnt_off0001008a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008A 5480 bytes
SHA-256: cc96994edd7a4e8c2fa0844f204b5b8123a21f70d54257c7befdcf608f8aebf8
font_02_sfnt_off00011349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11349 11356 bytes
SHA-256: 95e306938134cd0320dfc90ecf02e0ed032795aeb90e19a2ee7bd341ca78f6e1

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