Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f2af95fb42d582…

MALICIOUS

PDF

76.0 KB Created: 2021-09-16 04:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 27cbf26634a13dd435a40a46bab7420b SHA-1: 694bc76151ac103bf3012b4c672ad6c5d18f75a3 SHA-256: a0f2af95fb42d58205c5d7e9534e0f0d4ad69b98638ca19fd04cee13e11f9ee7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs and its classification as a link farm suggest it's designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://huntic.ru/uplcv?utm_term=install+plex+media+server+on+android PDF link annotation
    • http://aptwash.com/userData/ebizro_board/file/78031313776.pdfIn PDF document text
    • https://argumentua.com/i/file/kemenomuxi.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/bikevanutimu.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/vubokafawaxeradapevaw.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202193114536036.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/55954248909.pdfIn PDF document text
    • http://arablift.net/userfiles/file/munugakilodorulewodesetu.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/weluzopivopogerebemupelu.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/27183771069.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/dagidigomu.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/57742261617.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/1003084194.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/97169032424.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/89232481245.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/67348252441.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/suwovug.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/gopenotefiziw.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/refumoridovupalawufopaje.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/pozejakekabowotamagude.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/65206352217.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/sefoxi.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/19894190372.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/67589603172.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/xopefekebobudumuki.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_off0000c47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47C 17700 bytes
SHA-256: 33ba9e6e3efe0145a4845b701010be78d6793a68432bece24e33431cd9f779dc
font_01_sfnt_off0000f21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21E 10672 bytes
SHA-256: 70230ede790844f0d889657a6b15c51e0b9255d8bb9e96e8586457d4f6ea2f18
font_02_sfnt_off00010a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1