Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa0116fbd505bfc…

MALICIOUS

PDF

83.6 KB Created: 2021-01-13 07:30:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 52878fccc7f9f319f0a23585b5ae6551 SHA-1: 978edd3ccd40e6206ff78fb2261fe5377bb15bc2 SHA-256: 9fa0116fbd505bfc409246c8fa863dec1c3b5954ec324558a412051ca8bd4f0e
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs pointing to disposable hosting and redirector infrastructure, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and date information, indicating it was likely generated programmatically to serve as a lure.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/123?utm_term=realidades+1+capitulo+4a+answers+page+75 In PDF document text
    • https://fagutefoxod.weebly.com/uploads/1/3/4/2/134235025/a1210840405.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/ligoxeloterewubim.pdfIn PDF document text
    • https://volokosebu.weebly.com/uploads/1/3/4/8/134871595/882869.pdfIn PDF document text
    • https://site-1179273.mozfiles.com/files/1179273/lusivifevadopinat.pdfIn PDF document text
    • https://site-1177548.mozfiles.com/files/1177548/72056640592.pdfIn PDF document text
    • https://cdn.sqhk.co/jakadamalate/tdjb7jd/plex_windows_app_download_location.pdfIn PDF document text
    • https://site-1175359.mozfiles.com/files/1175359/defijavanemavodaralenojuf.pdfIn PDF document text
    • https://cdn.sqhk.co/xamapetarel/hcjjhie/61120385091.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452372/normal_5fc870944ed7f.pdfIn PDF document text
    • https://site-1177365.mozfiles.com/files/1177365/fivedulikidadukafifatokus.pdfIn PDF document text
    • https://site-1173264.mozfiles.com/files/1173264/nukedagobob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412905/normal_5fdf6bfbbbae0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ed17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED17 5684 bytes
SHA-256: 1d17babb35d27ae934a52a9d3092b18b60be0a54105fe4ac577fa8a510858f96
font_01_sfnt_off000100b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B3 12360 bytes
SHA-256: a7b1bb4feaa34b1fe2371eeb3dbf1a80c8ca8f7b37e1fb187cc37572ada587fb
font_02_sfnt_off0001297c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297C 16300 bytes
SHA-256: 1fd9273609cc32bf1ebf097959677c0d4ffee2395f4697f6a123f71f45b1bb84

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