Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e80886e745812fc…

MALICIOUS

PDF

83.7 KB Created: 2021-03-18 14:13:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: dff7f9592273b3a2f2ed6661837eed0b SHA-1: 26ba01bc58814b4792d194e9554a748fef26b5ba SHA-256: 1e80886e745812fc3303aeef6ab48a81d72151a79bf1a8b3a00e36184b395856
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the nature of the links suggests potential redirection to phishing sites or malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/strik?utm_term=is+delonghi+good+brand PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382189/normal_600c4641331d1.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/fLmTq6B/jubizanopixopiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421050/normal_6046849961f92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451970/normal_5fe51a1de8c47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470035/normal_600d53b3b255e.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwevini/GSichig/walkthrough_deeeer_simulator_2020_full_video.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482863/normal_5fe1b4ab29624.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459641/normal_6009b20a4fcde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411921/normal_601b28445310b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421462/normal_6032b979cd9e5.pdfIn PDF document text
    • https://cdn.sqhk.co/nepajenine/djBQeyp/tank_stars_hack_all_tanks_unlocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481423/normal_601d75ab7d7a1.pdfIn PDF document text
    • http://ruvinowuge.scienceontheweb.net/ergobaby_360_baby_carrier_infant_insert.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496826/normal_5fcabe9d852d5.pdfIn PDF document text
    • https://cdn.sqhk.co/bamikalagov/gidXWgc/what_happened_to_koala_puffs_instagram.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/a274a542-4ddb-433d-a793-088feba7b0ad/codigo_de_etica_profesional_de_trabajo_social_en_mexico.pdfIn PDF document text
    • http://pisonepegosa.myartsonline.com/44870443079.pdfIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_7d62eaa359d84d0cb122eb8bf507c72f.pdf?index=trueIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_0ce1f5b0b34c4c8fbd2fd8111b4485a9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c12abe8-fff7-436e-a24c-6e5d9a983fa2/aerodynamics_for_engineering_students_sixth_edition.pdfIn PDF document text
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_ef7a96e0e4a54706a2597bda4cc1e5e3.pdf?index=trueIn PDF document text
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_32f9474d86cb4a4a8ce44ada5d1df9da.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB02 4872 bytes
SHA-256: 63c6f2aa300502e6adefed9ff00d584c149c45d8f609cd89a0576d2d316d0df9
font_01_sfnt_off00010b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B67 11788 bytes
SHA-256: de3dcb93422518d150366777bc1238894133a3be2d8a6f7b460416508c663099
font_02_sfnt_off0001335d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335D 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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