Malicious PDF — malware analysis report

Static analysis result for SHA-256 842710ea09acb902…

MALICIOUS

PDF

68.0 KB Created: 2020-11-29 11:18:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 714e5c1516bb93bc58cbf0fa5da38460 SHA-1: d6a67bc927e28692178885cf20c1d0e2759ee861 SHA-256: 842710ea09acb90248218a4ffcb5ac866866711b9b1c40e4c0f9f931e80afcb2
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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/strik?utm_term=practical+emergency+ophthalmology+handbook+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4483586/normal_5fb4980b39a19.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/wudutexam.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/kovolobox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386091/normal_5f8ce57659a1d.pdfIn PDF document text
    • https://tagelararejo.weebly.com/uploads/1/3/4/8/134846357/4dc06.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vinivuxo/vidmate_ing_apps_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/dinowasiboguboperakuviba.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/figagaxopep.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/soxefutupap.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/math_worksheets_grade_7_gcf_lcm.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/tatakosokuvexobofemorate.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC030 5484 bytes
SHA-256: 59988431aff38826d13f98e2f803ee28bb56974142dd5db8f9d17fc287aa40b9
font_01_sfnt_off0000d297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD297 9956 bytes
SHA-256: dd9d9bd95c20dc309dcfdfc09dc8ac65357a6c1ffd5588a6029efaf580c7a187
font_02_sfnt_off0000f4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B1 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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