Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c61a4793af766de…

MALICIOUS

PDF

72.9 KB Created: 2021-03-23 05:58:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: dc89acfcb26d51bf1636783dd2a64b13 SHA-1: 3cdc46f89a8b655e0d24f783d55fbf3123218fea SHA-256: 2c61a4793af766de871363165599474f836569358c5ca7e8aec8da757fb9f2e5
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though partially garbled, suggests a lure related to an administrative report. Numerous external URLs are embedded, many pointing to disposable hosting or link farms, which are commonly used to redirect users to malicious content or phishing sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the link farm nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://resalured.ru/123?utm_term=informe+justificado+amparo+indirecto+en+materia+administrativa PDF link annotation
    • http://bukupiduge.mypressonline.com/bastien_piano_level_1.pdfIn PDF document text
    • http://vozajomaralamer.mygamesonline.org/24543563737.pdfIn PDF document text
    • http://nonoxutiwi.mypressonline.com/fifth_grade_math_workbook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372074/normal_6010d600ccfe8.pdfIn PDF document text
    • https://lopenedaxi.weebly.com/uploads/1/3/1/6/131606218/gatov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457862/normal_60314cdae21aa.pdfIn PDF document text
    • https://tarokomilidifuz.weebly.com/uploads/1/3/1/6/131636676/waponututisatusopo.pdfIn PDF document text
    • https://cdn.sqhk.co/nabowixufori/KChdggU/73205173611.pdfIn PDF document text
    • https://bixikobitil.weebly.com/uploads/1/3/4/5/134525497/midalixiwovo_kogilofofa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460678/normal_5ff0c98092aec.pdfIn PDF document text
    • https://wiwujakibites.weebly.com/uploads/1/3/0/7/130740442/bodunamimapovi-sumupu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413120/normal_60061099da1c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426699/normal_5febf9bebf55e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470019/normal_603e8a9951f59.pdfIn PDF document text
    • https://cdn.sqhk.co/kazamepa/jRLiehj/37996768359.pdfIn PDF document text
    • http://nunejabu.scienceontheweb.net/tivatuxanedesifojaxodaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476939/normal_5fdd6ed44eff4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486971/normal_60471a05c55ad.pdfIn PDF document text
    • https://cdn.sqhk.co/reparepoki/hj25phi/printable_calendar_october_2020_with_holidays.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427506/normal_602a360b22bdd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/03b4c743-f9f9-4905-8a0c-1a0d35dd4ce9/bruce_lee_songs_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7df42fc-e462-485b-87b0-7d2188ded6f9/webalibevomason.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd2a7f45-0cf4-4701-9d73-628b1d4a0858/50012510090.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8B 5344 bytes
SHA-256: 2f10af73fecc2bc42f66cf3e37d6b8888a2e72ed098ee5ee9c15878a45ed1da3
font_01_sfnt_off0000edb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB4 11676 bytes
SHA-256: e0b3e681037119e5eb442907c0f33e80328e8dfc8eeedb282b0e280f98e139f3