Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c31f302e931554…

MALICIOUS

PDF

72.2 KB Created: 2021-02-21 00:36:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a2c854582bb30f766cc9162bb41300e2 SHA-1: 7ed696af7ad70959d12df2555809ba6e567e4784 SHA-256: c4c31f302e931554c5999b935461a4bc5d39ea4cd36479f388300cf0c6111d96
214 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, and it contains a significant number of embedded links to external PDF files, suggesting a link farm or content hosting strategy. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were explicitly extracted, the presence of numerous external links and the malicious verdict strongly indicate an intent to redirect users to potentially harmful content or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=health+economics+journal+list In PDF document text
    • https://pibigetikuke.weebly.com/uploads/1/3/5/3/135387636/bikewuzupa-jijibija-jatozuxagemixo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378390/normal_600ea65f5c611.pdfIn PDF document text
    • https://vofitikasu.weebly.com/uploads/1/3/1/8/131871658/6c2714c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493200/normal_5fe13e27e0d8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406785/normal_60011832b8a54.pdfIn PDF document text
    • http://zumikavu.22web.org/xudiluvepabejatenufeto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370064/normal_5fe46b013c2d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500201/normal_6005f67a8a03a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393900/normal_5fe370693a935.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413977/normal_5ffb12efba62d.pdfIn PDF document text
    • https://voxisazemiruza.weebly.com/uploads/1/3/1/8/131871554/841b5a367193dbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493600/normal_5fe19ece4e46e.pdfIn PDF document text
    • https://xolijusir.weebly.com/uploads/1/3/4/0/134016651/2641121.pdfIn PDF document text
    • https://wujibinofowe.weebly.com/uploads/1/3/1/3/131383737/3861370.pdfIn PDF document text
    • https://gipimosikiji.weebly.com/uploads/1/3/5/9/135963651/loxekiwuxovefufikel.pdfIn PDF document text
    • https://zuzivosojix.weebly.com/uploads/1/3/0/7/130775151/67ce3c98558390d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sedilipabowarad.rf.gd/7551758771.pdfIn PDF document text
    • http://zolorame.rf.gd/california_driver_s_license_test_study_guide.pdfIn PDF document text
    • http://majuditatip.rf.gd/aicar_transformylase_imp_cyclohydrolase_deficiency.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_off0000df8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8E 5076 bytes
SHA-256: 1cf42e05e41aa3494cdfdd4fc00330556f91b2a2d2e3390e99f42ee2c124bd65
font_01_sfnt_off0000f0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A2 10228 bytes
SHA-256: 2320be395fd910a10574a8842587b7bd54bd29d9a8fe5e646731b09f868d18c5

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