Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e2b00a16aaf1f4…

MALICIOUS

PDF

76.7 KB Created: 2021-01-24 02:29:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74e52039ebf35ce1a21fe559f8a3d0ad SHA-1: da40d62f754575161b68a715ba7a7fbf6785ef51 SHA-256: 38e2b00a16aaf1f41bfbd58ebc320fc1c43c4c46e2aa183603ab43828a8cfc2d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a ML 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 designed to redirect users to potentially harmful content. The presence of multiple external URIs and the PDF_SEO_LINK_FARM heuristic strongly indicate this document's purpose is to drive traffic to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/aws?utm_term=seesaw+app+for+android
    • https://kivalake.weebly.com/uploads/1/3/4/8/134885121/b53dfe8.pdf
    • https://cdn-cms.f-static.net/uploads/4471988/normal_5fd2687c37c96.pdf
    • https://xezinaruwi.weebly.com/uploads/1/3/4/4/134479948/9274279.pdf
    • https://cdn-cms.f-static.net/uploads/4469828/normal_5fe7da3c6a93a.pdf
    • https://static.s123-cdn-static.com/uploads/4417998/normal_5fcbe4891cb46.pdf
    • https://movireralu.weebly.com/uploads/1/3/4/8/134879142/5373570.pdf
    • https://kujibolivobukib.weebly.com/uploads/1/3/1/1/131163991/pesafuwuv.pdf
    • https://nudabubi.weebly.com/uploads/1/3/4/3/134323665/jojiriruzubub.pdf
    • https://cdn-cms.f-static.net/uploads/4420260/normal_5fdc32bb4a298.pdf
    • http://tujozavido.66ghz.com/what_is_malaria_parasite.pdf
    • https://static.s123-cdn-static.com/uploads/4383131/normal_5fe0c418cfdbd.pdf
    • https://filofasifujutoz.weebly.com/uploads/1/3/0/8/130874575/5159507.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://lexepetilak.rf.gd/roots_and_affixes_worksheets_for_4th_grade.pdf
    • http://sudimomovaw.epizy.com/sat_answer_sheet_format.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a9.bin
c9386337013ef83fe38c309a4ee53a6f313a1fb7de10ebb5b1e0daec812785ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A9 4908 bytes
font_01_sfnt_off0000f267.bin
114e6a02011dc370ec809698a129747b1590fdef9f45b46106633fef5c5d8b77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF267 10980 bytes
font_02_sfnt_off000117cf.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117CF 4324 bytes

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