Malicious PDF — malware analysis report

Static analysis result for SHA-256 661f8e0edfe97c09…

MALICIOUS

PDF

72.5 KB Created: 2021-06-04 14:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d0856e7c21e893e0b049daa9d8174cbd SHA-1: 7f5664ce44575cd7b9ec07005378f15ea7e6fd57 SHA-256: 661f8e0edfe97c0974329ee68eb783c2591bd0aa177deb9c742790240051a2ec
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'scary jack o lantern faces stencils', which likely serve as a lure to direct users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://archism.ru/pbw?utm_term=scary+jack+o+lantern+faces+stencils PDF link annotation
    • https://neposuxanu.weebly.com/uploads/1/3/0/7/130740617/fejinuxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490720/normal_6027e18346e1a.pdfIn PDF document text
    • https://pevigegokepos.weebly.com/uploads/1/3/4/3/134366184/xexisegoveka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404755/normal_5fee99b59abbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390643/normal_60206db8cc4dd.pdfIn PDF document text
    • https://gomigara.weebly.com/uploads/1/3/4/7/134727279/3390017.pdfIn PDF document text
    • https://jijajaxasivezix.weebly.com/uploads/1/3/4/5/134588510/7788173.pdfIn PDF document text
    • https://weniwekozeg.weebly.com/uploads/1/3/4/0/134012595/3bbe1a.pdfIn PDF document text
    • https://sojasokavipives.weebly.com/uploads/1/3/4/6/134677313/salolalegav.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/9b4d63ed-2912-4090-a649-041ecdb1bcfa/percy_jackson_3.pdfIn PDF document text
    • http://savavaze.pbworks.com/w/file/fetch/144470772/45957409675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fb2d951-2369-487d-a0f1-7640098aceb4/75434029331.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e74eecc-77b0-405d-b6c1-738ad147cb23/4000_essential_english_words_2_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/144fbb3f-6ec6-4b4d-9f08-ba134a4d9835/55473813063.pdfIn PDF document text
    • http://zikasamu.pbworks.com/w/file/fetch/144434601/samsung_galaxy_tab_e_case.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/73787370362.pdfIn PDF document text
    • http://mukonisu.pbworks.com/f/boxuwuvupuxebumizoge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9dc8c24-c785-4ff6-ab26-f3499641a04d/why_python_is_best_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af890a50-c913-47bf-9bf5-21ad9a1515f0/15566472630.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_off0000e034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE034 5220 bytes
SHA-256: e0b463007e1b1a29fc534ec712ebee9501f1df39527a499c4e39b6caf8e5e107
font_01_sfnt_off0000f21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21C 10072 bytes
SHA-256: 9d9beb0084772b6528be3d47867fef92c8ae3916ba64572f6b308913ce04203c

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