Malicious PDF — malware analysis report

Static analysis result for SHA-256 b34cf63daba70cb7…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 22:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ca7962d2333e70b4c5c46b8da6248eeb SHA-1: 4fef57bddb1bc5eccadf95f357233bc2e10b6dbd SHA-256: b34cf63daba70cb768eb6705786df257cc90c57fbde9316a446e167729fa7180
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript and numerous external links, many of which point to disposable domains and are likely intended to host further malicious content. The 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics strongly indicate a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://garglob.ru/uplcv?utm_term=install+game+on+play+store PDF link annotation
    • http://wojno-stal.pl/pliki/file/tumomusafafanemo.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/11150123025.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/juposakisososup.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/tifupevorimitu.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/86070583140.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/89424794162.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/bimuveduvonikiragotirigu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb3df81765---40538246130.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/72138781258.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/minubedofifuzezivelime.pdfIn PDF document text
    • https://tomaszbizon.pl/web/uploads/files/jijusakibidabavalonijofoj.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/51204871941.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/84085066920.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/zubirunixivekojalu.pdfIn PDF document text
    • http://weldingplaza.com/files/file/lonedezemaju.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/vugedotosazut.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/zenis.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/55654241352.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/dokupoboxegosemefilowan.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/fosojufasowedoxojekaveze.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140e10dd08cf---41749485647.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/vasajuvovetomiduwim.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/23852358575.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/pisijofolut.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/pawokarosew.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_off0000d98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98C 10568 bytes
SHA-256: 018e2ca2800c1944768289afcc44055caf301bf096363981ad9368452fbe68af
font_01_sfnt_off0000f1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AB 17664 bytes
SHA-256: c1a24bad903f6f7db012878a881b2601af3a55017f425a881ac6fa4640e479fb
font_02_sfnt_off00011f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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