Malicious PDF — malware analysis report

Static analysis result for SHA-256 d311d75bb10abf25…

MALICIOUS

PDF

76.1 KB Created: 2021-05-26 09:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6d4ca39d5d2a5e5d17dacc045c607ed7 SHA-1: 20141ca75956dd3fd365ad84362ba1e372c8e260 SHA-256: d311d75bb10abf25dc241ee000b5d7938a4a5e5ab9a7fefeeaad6f09cc43d99d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the document's structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • 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://bologen.ru/strik?utm_term=5+shelf+bookcase+target+extra+shelves PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389604/normal_5fde8ba7ae667.pdfIn PDF document text
    • https://wobafelu.weebly.com/uploads/1/3/4/6/134613510/cc7b4ec1e41b14.pdfIn PDF document text
    • https://senidexug.weebly.com/uploads/1/3/0/7/130775540/danuzafo.pdfIn PDF document text
    • https://gizazegixewaner.weebly.com/uploads/1/3/4/5/134596748/81d45ae68b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409992/normal_605f5ae0af6f0.pdfIn PDF document text
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/e643c0313.pdfIn PDF document text
    • https://jikurufor.weebly.com/uploads/1/3/4/6/134613562/vopaw_zokojikipi_jelalix.pdfIn PDF document text
    • https://nagorulanol.weebly.com/uploads/1/3/4/4/134465391/sifife-kujegomovija.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412606/normal_602b48bf77981.pdfIn PDF document text
    • https://podesasi.weebly.com/uploads/1/3/1/4/131437149/0971cc2277d6a52.pdfIn PDF document text
    • https://vadiduriku.weebly.com/uploads/1/3/4/4/134445950/5834461.pdfIn PDF document text
    • https://pozategon.weebly.com/uploads/1/3/2/6/132695347/1038920.pdfIn PDF document text
    • https://bunemanedadon.weebly.com/uploads/1/3/4/4/134476229/739000.pdfIn PDF document text
    • https://kifajiziwezu.weebly.com/uploads/1/3/2/7/132740821/4bb58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427094/normal_606083683f2cd.pdfIn PDF document text
    • https://wajefoxefibivi.weebly.com/uploads/1/3/2/8/132814680/8448849.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7d7447f8-1246-409f-a4e1-82f98bd8ab45/tasalewor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1a72bd9-52bc-43cf-abf0-22e5bd9bd343/38517087345.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29b9c786-c518-4d5a-bec0-a00d9bc91fc3/sao_light_novel_16.5_ita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02bed1ec-562b-4b51-9aa9-d89fe5ae5178/harrisons_manual_of_internal_medicine_20e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeab6749-c65a-4f1f-92c6-149748ea3105/how_to_thread_singer_patchwork.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/209d19f4-2858-442c-8fae-b82b15870076/butovevajaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9792a53a-6168-4f4b-8007-ab1be27ec177/examples_of_personal_values_statements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed563c95-8485-41b4-ab78-e8c4419009bf/40291067708.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC30 5140 bytes
SHA-256: c816b2eaaa67e008859b944f61d34717fa0a1949a60f079d8bfe4f9271ef6f7a
font_01_sfnt_off0000edc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC3 10864 bytes
SHA-256: d3bf55d2cd7803bfcd4f7c56c98c60074713e7623bed29e9ce5618eb1d731c6b
font_02_sfnt_off000112d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D7 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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