Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7f941a8fbc541c…

MALICIOUS

PDF

72.7 KB Created: 2021-06-03 06:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 907f38795f8da3db9aa7657bee839761 SHA-1: 70d0a438465540c0ed174d0ce514a5cd3724926d SHA-256: 1c7f941a8fbc541c7efdeda30a2f19acc8af76aa8f1be712be2263d00f7cb5d4
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

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=what+is+enthalpy+change+of+neutralization PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462362/normal_5fd3db66dfad8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410722/normal_5fd040268737b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469119/normal_60580e17a0d3f.pdfIn PDF document text
    • https://kowulenube.weebly.com/uploads/1/3/2/7/132740682/2802191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411001/normal_6035327e4b619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412902/normal_6040f6ef7eee4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369763/normal_5ffb3f8b99aa6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383327/normal_6000e49fdcfa5.pdfIn PDF document text
    • https://depemazijibibo.weebly.com/uploads/1/3/4/8/134846300/pawujizekofotaganow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471710/normal_604ace69680d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475000/normal_5ffc372059f17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501998/normal_60430530612a4.pdfIn PDF document text
    • https://wexapifunoru.weebly.com/uploads/1/3/4/7/134715363/zunifosef_kilofu_bezeweruna.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390661/normal_5ff8cc20bab3c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gonumutat.pbworks.com/w/file/fetch/144512463/free_shutter_count_review.pdfIn PDF document text
    • http://nagaxop.pbworks.com/f/network_management_tutorialspoint.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/f/python_coding_exercises.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_off0000de5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5F 5440 bytes
SHA-256: 4724f2c1bc31149e664ae829ac2ab273959aa0e42d7b38eef728de2b9953ea19
font_01_sfnt_off0000f0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FE 10812 bytes
SHA-256: 3060534805a606486b587ac662d9dda6107ce53e3db58a5e239139d8bf057b80

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