Malicious PDF — malware analysis report

Static analysis result for SHA-256 405662f8a0cb27c9…

MALICIOUS

PDF

68.6 KB Created: 2021-01-31 04:03:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4212f51b815889899032e0b4d2d94b91 SHA-1: 7a9435f582fd6f48e1abd64609bc35db0df470db SHA-256: 405662f8a0cb27c94d3bd476ef1d3fe793cb2f61e270f0fb0bfcf1003d3e72e0
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or redirection scheme. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to manipulate search results or redirect users to potentially harmful content.

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://seumenha.ru/aws?utm_term=chathikkatha+chanthu+malayalam+full+movie PDF link annotation
    • https://tariroviwobin.weebly.com/uploads/1/3/4/7/134715354/wuwikanubag.pdfIn PDF document text
    • http://mowuvivof.22web.org/bokitemewojovawop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404514/normal_600f1f9989dcc.pdfIn PDF document text
    • https://rigivopamakor.weebly.com/uploads/1/3/4/8/134869382/6576215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382793/normal_601292b183921.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411714/normal_5fff41b5cd2a2.pdfIn PDF document text
    • https://didekupava.weebly.com/uploads/1/3/1/1/131163833/8635615.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457296/normal_600a5ed3b77eb.pdfIn PDF document text
    • https://polatoni.weebly.com/uploads/1/3/1/3/131379392/pijoturerof-pixalevutama.pdfIn PDF document text
    • https://xiruzukigipimog.weebly.com/uploads/1/3/4/8/134865515/3388390.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384647/normal_6011726abc74c.pdfIn PDF document text
    • http://rikuximuvo.iblogger.org/tamilrockers_tamil_movies_free_2018.pdfIn PDF document text
    • https://dowamodugepaxa.weebly.com/uploads/1/3/0/7/130739159/7545412.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vuropomap.epizy.com/61948962699.pdfIn PDF document text
    • http://wagopof.epizy.com/relative_vs_absolute_dating_worksheet.pdfIn PDF document text
    • http://nolepukopele.epizy.com/20214228467.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_off0000d1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C5 4980 bytes
SHA-256: a8b467806ed737960ef441b94919356e918399e8977907e5b09f1102868728ba
font_01_sfnt_off0000e2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A2 10260 bytes
SHA-256: 16c14e96830131db030b2c1d27c7f54af66f3af05960654ff4f8a76b2e38e0ba

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