Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e44a2045bc5ac7…

MALICIOUS

PDF

71.1 KB Created: 2021-09-12 10:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 18331b8056cd7dcc232ec85307ee0fbe SHA-1: d98f6e17c7be5dc1199c59f3c0c0fc841d995358 SHA-256: 03e44a2045bc5ac721321dfb12aa68e992a43e5aaa7adf9d9f9e73b570dbc216
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which are structured as link farms on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs, specifically one pointing to 'archism.ru' with a 'minecraft download' UTM term, indicates a lure to download potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=minecraft+download+1.19+1 PDF link annotation
    • https://yptea.com/data/fckeditor/files/95113873780.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/kupevitob.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/jivonobijisutubevuruzanak.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/laditovase.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1630555832.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/zotajazanofozavokinekita.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/vadudigupujavawifajaw.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/gaposesewonabisu.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/jotezoda.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/25957063165.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/livudadudonapasoxenuzuz.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/ditubinub.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/14084583001.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/91668989091.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/visebelagebudoridajibo.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/galevowugimo.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/ea0a54904858fc73d214a3afced0b449/bajuxisenelikaxegaf.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/52087c46a57bc80bf1f7e39e4c5bdd8b/21873308172.pdfIn PDF document text
    • http://schubert-hh.de/image/file/30845124566.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/86817728080.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/zipovodutupolixokalodene.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_off0000b5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F4 15864 bytes
SHA-256: df914a6b43253a51faed952db894b6481ade86cf63204d8cd92ac0a829d5fe64
font_01_sfnt_off0000de58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE58 10668 bytes
SHA-256: a96467d376aa096488ae50471ddc5645739aa2b50928e996c73691166d63e611
font_02_sfnt_off0000f711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF711 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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