Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d2a1dae7d620fa…

MALICIOUS

PDF

70.5 KB Created: 2021-02-22 09:41:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1e1a516f4f8e738ca2f0b715962c59c6 SHA-1: 7bb4b29aa1891069bf7b8330b7ef1cfcee5676fa SHA-256: a0d2a1dae7d620fa623d26057ae761ef4de2e0ca4a9ba8bcb2d470143bfb900e
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://bologen.ru/wix?keyword=chemistry+comes+alive+chapter+2+study+guide+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369322/normal_5fe9571793764.pdfIn PDF document text
    • http://podcard2020.site/sas_ods_excel_format_number9snvn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480387/normal_602eb8246de40.pdfIn PDF document text
    • https://gegawega.weebly.com/uploads/1/3/0/7/130739786/fufulok.pdfIn PDF document text
    • https://cdn.sqhk.co/jemitaso/gcAiaeW/recharge_mobicarte_sfr_maghreb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471240/normal_5fe01211790b0.pdfIn PDF document text
    • http://fitdieta.com/woxaxudezm27l.pdfIn PDF document text
    • https://cdn.sqhk.co/lukapokobejo/EchfGML/powezomibineximag.pdfIn PDF document text
    • http://selowopax.22web.org/tebogufijaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407571/normal_5ff28f91cb0d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466175/normal_5ff281f7334ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nesazovopiw.rf.gd/98492533547.pdfIn PDF document text
    • http://sopixixu.epizy.com/busonid_spray_nasal_bula.pdfIn PDF document text
    • http://bixoravu.epizy.com/jenetovagoke.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_off0000c7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B7 5776 bytes
SHA-256: c765007ad4fc0007ac8da745874fad28729905012d31af5db3a3886fd9b74363
font_01_sfnt_off0000db4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4F 10324 bytes
SHA-256: 4c9a8d3a3b8408e88fb304318635fa4be1d0d10de33b119ba76cf1610497fb34
font_02_sfnt_off0000fe8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8C 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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