Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c1306f47ffa1a5…

MALICIOUS

PDF

83.0 KB Created: 2022-04-08 02:39:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-04-02
MD5: 41dfd9d87feabd533d2ac9e59d20959f SHA-1: 9d050507aaf4806185b9d0106c2fb960accadcf3 SHA-256: 25c1306f47ffa1a5c6e00430452165adf49725450958d98d4058d209445c61d0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links pointing to other PDF files hosted on disposable domains, indicating a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the sheer volume of outbound links is highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://diruwogedow.weebly.com/uploads/1/3/1/3/131382439/3934215.pdf In PDF document text
    • https://fiwarurebel.weebly.com/uploads/1/3/2/8/132814972/jumiwesekowa.pdfIn PDF document text
    • https://jokazetesolibut.weebly.com/uploads/1/3/5/3/135314514/gevoka_vosagofinowed_pebedep_katule.pdfIn PDF document text
    • https://rogenogenitel.weebly.com/uploads/1/3/4/3/134316557/2127107.pdfIn PDF document text
    • https://balatonpremiumvillas.hu/webroot/upload/files/67985924913.pdfIn PDF document text
    • https://degezikesobito.weebly.com/uploads/1/3/1/3/131384018/wesifika.pdfIn PDF document text
    • https://vasalidut.weebly.com/uploads/1/3/0/9/130969475/1571664.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/nivulerobofinasu.pdfIn PDF document text
    • https://kixuvatapowow.weebly.com/uploads/1/3/1/3/131383305/pilino_zatevebo_kexeri_lesorinetiki.pdfIn PDF document text
    • https://polavimiwusirew.weebly.com/uploads/1/3/2/6/132681763/selibive.pdfIn PDF document text
    • https://telavepifamika.weebly.com/uploads/1/3/4/3/134352802/vubijapolez-womotaz-xobetijuwik-gibanakipo.pdfIn PDF document text
    • https://jonexizuli.weebly.com/uploads/1/3/4/2/134235370/sedotufurowonorux.pdfIn PDF document text
    • https://vaxudiku.weebly.com/uploads/1/3/4/7/134709892/d46bb5.pdfIn PDF document text
    • https://nirorelenejukal.weebly.com/uploads/1/3/4/3/134316721/4c57f1c966d6400.pdfIn PDF document text
    • https://debagodijif.weebly.com/uploads/1/3/0/9/130969595/muvax.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/rikonofilonezon.pdfIn PDF document text
    • https://fuloronarenor.weebly.com/uploads/1/3/4/8/134880411/wefilaze-jilaf-bogod.pdfIn PDF document text
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/penusibudonegoni.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/62794941920.pdfIn PDF document text
    • https://sunuf.co.za/YmrXLWy8?keyword=black%20and%20decker%20single%20cup%20coffee%20maker%20instructionsPDF link annotation
    • 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://dejavu.sourceforge.netIn extracted file (font_00_sfnt_off0000c1fc.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off0000c1fc.bin)

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FC 17664 bytes
SHA-256: 7d18d76047deba242e62d2777b38ecd0c48c391997a6ef8f95dfa362a696f0dc
font_01_sfnt_off0000da67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA67 18392 bytes
SHA-256: 5005ec67da1cee9dbc9d26acb65aec8f98c4a1897dd8232a5a1afae79b621812
font_02_sfnt_off00010b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8A 11208 bytes
SHA-256: 6c2cddcf0d5f80cee6fb0b804902c5fa030be3023a4931d7e6525b2e432b0b2f
font_03_sfnt_off0001259b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1