Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a3be700da04a9f…

MALICIOUS

PDF

82.1 KB Created: 2021-10-07 13:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 874105bd8656e673fbb0beb70810da44 SHA-1: 415a157ef42118362bf2683a3ff9bbda7471e4aa SHA-256: 87a3be700da04a9fe08aa5adeffb16d962bd34df789818f136253e1c23704877
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=free+birth+stats+template PDF link annotation
    • http://www.primariasantana.ro/uploads/file/rogiperuvulinanojona.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/13022640546.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/10206162328.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/19612214272.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/63931623893.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161414e6f3f154---kifazorof.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/sabalebuvabut.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/rizokejebexi.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210904/file/nedebuxuzin.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/toruwanada.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/rulidalojovawikow.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/xapobisoragori.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/73635489408.pdfIn PDF document text
    • http://allycatering.com/userfiles/xumeboxovegakubumarek.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/sarumuranarajin.pdfIn PDF document text
    • http://superazs.ru/images/news/file/70446326821.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/57108705406.pdfIn PDF document text
    • http://gewald.ru/content/Files/59465670300.pdfIn PDF document text
    • http://xmst.com.vn/app/webroot/uploads/files/22862354222.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/1001146213.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210915_AB004EAC67252B67.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/50240911182.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/zimanedafa.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/genotepupanapabiv.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-12/images/files/meguboju.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://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_off0000d94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94C 10412 bytes
SHA-256: e205284d3761804091b438cd20b0d10d806452c497499b5bf6445a5f3a289fa1
font_01_sfnt_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B1 19196 bytes
SHA-256: ed1ddc7e864f993af3727784d2c9ffe404328387e31b3373567b0b449de83c39

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