Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e18de8e8dc7ee8…

MALICIOUS

PDF

92.5 KB Created: 2020-11-18 18:41:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 30f8f15f0cb9770237392e45fc4e2ab7 SHA-1: d1be14df0ebc9870a3005dd59e839caf0d67e77f SHA-256: 85e18de8e8dc7ee82e85ce8c80eaa8e8ae0d71ad1b6c3a3340baaedf8131a7c1
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-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://traffmen.ru/strik?utm_term=marantz+av7703+review In PDF document text
    • https://xoniwolujejusun.weebly.com/uploads/1/3/4/4/134456196/sukaf_biloxagoba_resijired.pdfIn PDF document text
    • https://suvejuxib.weebly.com/uploads/1/3/4/3/134380783/natixumebud_ridikag_tegojebazuvovew_nekitumo.pdfIn PDF document text
    • https://gevafitasib.weebly.com/uploads/1/3/1/3/131380901/e27909d0be.pdfIn PDF document text
    • https://zerexiborugixa.weebly.com/uploads/1/3/4/7/134705556/991020.pdfIn PDF document text
    • https://godowipi.weebly.com/uploads/1/3/4/5/134520373/d92136f.pdfIn PDF document text
    • https://fukikabigo.weebly.com/uploads/1/3/4/4/134457586/790787.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/2e974aa5-3c11-4d21-9c22-75c423941c6f/list_of_english_words_with_silent_h.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/538418b4-28ed-425d-9cc6-65c84bfba9fc/rixulogapabativi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/800ef55a-2959-426b-84d1-71106984a80c/tasiberosuxunafuxolisuvuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce8a6be2-fc39-4ff9-9c05-378a51db5df1/78099870623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b3b788f-a19f-407d-8279-9e017f4ceb67/nawaxomevobosegipebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aa40ec0-f113-424b-bf5a-3b0a9e4291b5/temas_de_bacteriologia_y_virologia_medica.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_off00012378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12378 1872 bytes
SHA-256: 9fba9b0d9e2cc48f58c52755440c9a9bb3bd4c5dbe3d8c853d7e81cca7fbdf20
font_01_sfnt_off00012c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6D 5064 bytes
SHA-256: 3bb2590cc68a069d01f662c8b356c1186aa366f947feaf1ab8c3e9086d662b15
font_02_sfnt_off00013de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE5 11528 bytes
SHA-256: 2cfd2d6eeee63ecbe8414754a12340cecf0511c6675512e9c1ef44fc21a61dd1

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