Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b38101b58cfcc8c…

MALICIOUS

PDF

92.6 KB Created: 2021-09-09 15:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 317e438aa70bce21988f140ca8107347 SHA-1: 9ef805823bddc04746b1b2596d036f6cf90f7678 SHA-256: 3b38101b58cfcc8c6f1ad40248b1b90ebd8023f8358313fed46119f39c3920f1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The heuristic firings indicate the presence of JavaScript and external URIs, suggesting the script likely redirects the user to malicious websites. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://nepodoshlo.kz/ckfinder/userfiles/files/kelodovoxisezutuzadiwuveg.pdf In PDF document text
    • http://letresorellebio.it/userfiles/files/dofovade.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ff5247a4a8a05c4a212bc8117b3be98a/68660290203.pdfIn PDF document text
    • http://osayit.com/images/file/24127968837.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/doxumojatazasi.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/e6ft09h7l2l7l99d3q1543q830/55989196915.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/jimebomobojadiwikab.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/3690577329.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16134f0bf807a8---27914717097.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/18494496049.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/98516787206.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/lolegasovuporuto.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/mutagetogufat.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-1/20210901225651566142.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/tikaforepogasapomufa.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/78347091870.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/jiwivezesu.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/bigose.pdfIn PDF document text
    • http://china-guolin.com/filespath/files/20210907175254.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210904062716_4u9904.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/repejogosavotevelalatafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=moqi+i7s+smartphone+price+in+indiaPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/pitajewi.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_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 20716 bytes
SHA-256: b74dd286d639cebc9911e9a1c2711d67b7eac11bacd3c320bd4ba126a763f354
font_01_sfnt_off000133df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DF 10924 bytes
SHA-256: 35ef994e0a4ae643845d99026ae409c2cda7021d77b1b341817fefd3818151fb
font_02_sfnt_off00014cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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