Malicious PDF — malware analysis report

Static analysis result for SHA-256 749cbb6fe5deae67…

MALICIOUS

PDF

83.2 KB Created: 2021-06-02 11:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a3af95373b8ee8bd034157666d1af84a SHA-1: 1585d388ea8cc6747958d1d74f46e98117a1cc54 SHA-256: 749cbb6fe5deae67e0b9fc05ab7b05e406a0d03d8910eabb64a8db38c644f278
126 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 phishing attempt. The document body, though heavily obfuscated, appears to reference a 'Rinnai tankless water heater manual' to entice users to click on embedded links. The PDF contains a large number of external URIs, many pointing to disposable hosting and forming a link farm, suggesting a phishing or spam campaign.

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://allytemp.ru/pbw?utm_term=rinnai+tankless+water+heater+r94lsi+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368952/normal_5fdfd9e10cb31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377662/normal_60467545d5648.pdfIn PDF document text
    • https://tefojemitadu.weebly.com/uploads/1/3/1/6/131606809/915d2f075e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468261/normal_5fecd15c6486f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409614/normal_603c6f324e252.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4404738/normal_60b5177d5f9ca.pdfIn PDF document text
    • https://gegirugotosizuk.weebly.com/uploads/1/3/5/3/135397722/5914443.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lulimogosan.pbworks.com/w/file/fetch/144492402/how_much_does_honda_transmission_fluid_cost.pdfIn PDF document text
    • http://xiwitanul.pbworks.com/f/3975563305.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/f/section_13.1_ecologists_study_relationships_study_guide_answer_key.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/f/property_management_agreement_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a9e8e12-3438-44ba-8523-46b2bbaaaf36/18515009775.pdfIn PDF document text
    • http://tubekikewabi.pbworks.com/f/virgil_seedfolks.pdfIn PDF document text
    • http://kepigiwup.pbworks.com/f/bafanezaladaliwefetu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/716db5d3-b460-4924-a6b7-2a92760cd779/53547211494.pdfIn PDF document text
    • http://polubisoxuwo.pbworks.com/f/kagudolupanovaneposemi.pdfIn PDF document text
    • http://dipoziw.pbworks.com/w/file/fetch/144451566/pradhan_mantri_awas_yojana_pune_application_form.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/f/jedobudo.pdfIn PDF document text
    • http://jutifakukap.pbworks.com/w/file/fetch/144497121/51535192197.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_off0001074b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074B 5332 bytes
SHA-256: 61bf58d7d78d35cae3c44b2291905f2655d86eb926e7493cc101e94e3a5def79
font_01_sfnt_off00011960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11960 11160 bytes
SHA-256: e209c2794a8402d8a653bf4d90148f2016f549fa9aa9d4c07c094f97ae5d39bc

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