Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4a47d2db9899ce…

MALICIOUS

PDF

84.4 KB Created: 2021-09-23 00:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 70c2d6afd5141c425e803501916475f0 SHA-1: bcaca2cd8a89fd406bf3b46f3822509ef6c67149 SHA-256: 9e4a47d2db9899ceaada485cab7dd142387b0372cc2ebb514e5ed61c5e6f86e4
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects to external URLs, such as the observed `https://catamma.ru/uplcv?utm_term=pvz+2+android`, which are often used for phishing or downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=pvz+2+android PDF link annotation
    • https://marikakozmetika.hu/editor_up/nadumenubakitik.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/5383816873.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/donutipob.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/kokuvowo.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/3865148841.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/71238677947.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/dekanu.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16149d132eafcc---meripesebekamozube.pdfIn PDF document text
    • https://ysh.my/userfiles/file/nimirimerarimomeze.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210921070307.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/38142720669.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/fovufilor.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/62953068436.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/39646851543.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/risovuxozimusojog.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614549665e8e0---45946013370.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/bipewidojokusivawinek.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/tonujumevowijetiwujame.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/givaxoruzilut.pdfIn PDF document text
    • http://zerosquareonline.com/file/55088162012.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/mapitakelulabelufagowefod.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/mujuzamikogeparikat.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/10759695761.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_off0000e43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 18968 bytes
SHA-256: 72c570b721b63b150fcb693604a7d8e4352be66657d2cd5d3ce3376dd70551e5
font_01_sfnt_off00011631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11631 10044 bytes
SHA-256: c2cc6d2458e59b782b9b78c65b7b754b4ba614743a54fbe68bdee5f2946df509
font_02_sfnt_off00012ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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