Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b6bfad02b11da6…

MALICIOUS

PDF

80.7 KB Created: 2021-05-11 15:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 1be737e00301ba1f3506b69c39bf8e5b SHA-1: 8098f8805b27f338e850f839f2265084ca595599 SHA-256: e2b6bfad02b11da6e1c8e5ecb5be675f710ed73e3c93c51b156cd45472803fdf
186 Risk Score

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, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=al+quran+al+kareem+uthmani+rasm PDF link annotation
    • https://cdn.sqhk.co/wusirilunoko/jgWKuhf/free_maintenance_reporting_software.pdfIn PDF document text
    • https://cdn.sqhk.co/wobimore/etwYyge/pawikaxutaken.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382770/normal_6024c1fc981f5.pdfIn PDF document text
    • http://fadewujetenuve.mywebcommunity.org/68207852159.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413455/normal_5fe94ccc89795.pdfIn PDF document text
    • http://durebemidiges.getenjoyment.net/apprendre_le_franais_cp_gratuit.pdfIn PDF document text
    • http://vurujupafowutox.mypressonline.com/askep_fraktur_antebrachii.pdfIn PDF document text
    • http://rusewigojubilon.mygamesonline.org/greek_mythology_vocabulary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445338/normal_5fec49c379e52.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_61cec2e1ffa94afeada1a57b7a39c598.pdf?index=trueIn PDF document text
    • https://37e79482-e567-4eff-b449-6ea9b90d4679.filesusr.com/ugd/cff0cd_e527ecb543af4fa986f1b5f7a2553453.pdf?index=trueIn PDF document text
    • https://d9c73feb-c945-4d97-9d44-ff62a4b57c47.filesusr.com/ugd/12056e_2305ece0a16840208b902c6f19b4d181.pdf?index=trueIn PDF document text
    • https://5f90d536-2a72-4461-adff-280afd3056cb.filesusr.com/ugd/27c394_d736e8f13a964b8c98eae6664239ee79.pdf?index=trueIn PDF document text
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_2546461a98f54831a90d2d95b832bb81.pdf?index=trueIn PDF document text
    • https://63dbeab4-18c6-4677-a808-17cd77aec119.filesusr.com/ugd/963d80_b15059b574904bec9ea8edad4563493f.pdf?index=trueIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_80c95673c618401da87d8ab76299b103.pdf?index=trueIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_ae647d37676f48469bcd6ed592762d60.pdf?index=trueIn PDF document text
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_67afd5faa7b84c85a67d72e75829e784.pdf?index=trueIn PDF document text
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_7337f2fbb5494e5b9bd5daa1989e1ea3.pdf?index=trueIn PDF document text
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_b6150d81d45e471fa3f2ee78249cb7b3.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8ED 5104 bytes
SHA-256: 0b6636c85db1d25bc6b30eb8573c8f3a45d4124e7b111fbe7465956574f79e3a
font_01_sfnt_off0000ea25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA25 12900 bytes
SHA-256: 6560c5b61b4f6e2497af2374a19c6a4910b425b1e6d61eaa26adc7938dccac35
font_02_sfnt_off000112d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D2 23012 bytes
SHA-256: fd0109886b40c5369df09f8eaed6520310f3bef059f23209bb08c600b374a292

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