Malicious PDF — malware analysis report

Static analysis result for SHA-256 327b3720991c356a…

MALICIOUS

PDF

80.2 KB Created: 2021-03-23 08:12:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e85e1fa1780ffa156ef3adae4cd30466 SHA-1: c4f42938e9e0e8f1d85aaccadbe094e48e2e818c SHA-256: 327b3720991c356a04207cbccb4a3e35e75be6ec951984cb359a320fc28fe8d7
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely used as a lure in a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=characters+in+the+miller%2527s+tale PDF link annotation
    • http://majexifavel.scienceontheweb.net/rudoxapexawavugij.pdfIn PDF document text
    • http://bawilidow.mypressonline.com/biblia_de_referencia_thompson.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_ecd18d03c5f24800bc1af31f261c656c.pdf?index=trueIn PDF document text
    • https://27aa3d6a-fcc1-4574-a8e0-77dd5bf64dcc.filesusr.com/ugd/7683ec_a837a4ffa5e946a99086d4e252e1c27d.pdf?index=trueIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_58a8985638f044a2945420a9723ee31a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b6dc09d-e62c-46c9-b3d9-03923f0f6e96/18627056717.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f2b4ab0-6376-495e-9991-9594de756f88/33738103917.pdfIn PDF document text
    • http://wenulusevikofa.myartsonline.com/icao_annex_7.pdfIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_63aacc19ea7347ec9037282f7df0fe04.pdf?index=trueIn PDF document text
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_6fbf51e639364527a92a355c0e685f31.pdf?index=trueIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_08ec88710009477799be628e6a9dac00.pdf?index=trueIn PDF document text
    • https://e44de090-c64a-4a0f-b555-2784aa0ac37b.filesusr.com/ugd/41d583_d7600a53c9b6419f9a0a22d2f834b4c5.pdf?index=trueIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_ced6914ff1864a17a4f5d9b97be2cc1c.pdf?index=trueIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_60be1e3b87ab4396abbe7bdb6909135f.pdf?index=trueIn PDF document text
    • https://d787a32c-196b-4e99-9c98-3ae3c28023f9.filesusr.com/ugd/05b469_1e01e84a5d4a42ba9335a32dacb0499d.pdf?index=trueIn PDF document text
    • https://02e0da19-eac5-4521-950b-4e410541bf1c.filesusr.com/ugd/516249_ae2cea7d7ba74a238780526c2503da45.pdf?index=trueIn PDF document text
    • http://bokawevetejap.atwebpages.com/82298423773.pdfIn PDF document text
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_0738b6629a1d4d1592d5b3c3587cbcd4.pdf?index=trueIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_7939972d3cea43c59072add1fbe19477.pdf?index=trueIn PDF document text
    • http://jitawidavez.atwebpages.com/animal_encyclopedia_free_download.pdfIn PDF document text
    • https://f1e11ea9-a931-46ad-af30-391325c877dd.filesusr.com/ugd/423518_6f9ef6e0bbd44c009085237d164e304e.pdf?index=trueIn 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_off0000fcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD2 4976 bytes
SHA-256: 2ecf4e758f7b55dd8aed1f2a5286121cdba4a4d10ffa4f290af4a6798f43fd6a
font_01_sfnt_off00010d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D91 10580 bytes
SHA-256: 5055df2f4a5d6ba52f257800ab031f9110477e1e02bd1fd722d36bc621dd864d

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