Malicious PDF — malware analysis report

Static analysis result for SHA-256 e623a56e94969b06…

MALICIOUS

PDF

72.1 KB Created: 2020-11-14 05:42:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f464382bc4503ac4a35f2b35c61c9265 SHA-1: 5695bfea8b9e9aa874f32285647c20418c5a5cb6 SHA-256: e623a56e94969b06e7fd8f74403e6122c347868385c9f35dbbd95548019a7b16
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a link farm with 28 external PDF links, many pointing to disposable hosting, and one critical link to a known malicious redirector. The document body is heavily obfuscated, but the presence of a link farm suggests an attempt to distribute malware or conduct phishing by directing users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://gettraff.ru/strik?utm_term=psicologia+fisiologica+ruben+ardila In PDF document text
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/nokoleten.pdfIn PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/6982591.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417049/normal_5f9ea18d9feaf.pdfIn PDF document text
    • https://disanelazutiwi.weebly.com/uploads/1/3/4/3/134361230/tixajuvebivem.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/sefaritonos-nukivafeka-retisebop-regaxumex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404502/normal_5fad4674c02a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420587/normal_5fa0b78c2db06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367304/normal_5f88123f1f421.pdfIn PDF document text
    • https://pixogapowirotuj.weebly.com/uploads/1/3/4/6/134641161/7907547.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_5f870fdd54dbd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wifozuxeku/kininegarulivomolimaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5eb4fbf-e7ef-46f1-8104-94571573cf39/genel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4f7be2c-e384-4471-9aaf-d4bc679fec61/82436086848.pdfIn PDF document text
    • https://s3.amazonaws.com/medadele/abbyy_word_converter_free.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_off0000d9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BA 5328 bytes
SHA-256: 685e3b545678993a9de0a12337176665e390017edaae2fb27e23496759a0ade2
font_01_sfnt_off0000ebe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE6 11540 bytes
SHA-256: af15fea2da4cb37799d94fe0d2575278cc3d7e2b68cc7ec99e339ff36f452724

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