Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7027ede18d9ad2…

MALICIOUS

PDF

76.7 KB Created: 2021-09-29 09:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c4ca81676bb6283cecf59dfb23deee52 SHA-1: 8571ddb7eec8ddfcc05adb654b6c425d8552e645 SHA-256: aa7027ede18d9ad22d1b506ed3f2c3ee05520eb00d00c5d5d4dc7360e07ced18
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the redirection or downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://catamma.ru/uplcv?utm_term=vlc+media+player+android+download PDF link annotation
    • http://mailcontact.jp/uploads/files/13645424157.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/bekepedazodijuzemobawipiw.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/jeraxakivovita.pdfIn PDF document text
    • http://tulga.ru/editor/files/71856902434.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/kurisozodawusabilevenomun.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/pidimi.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/zagaketetukifixuvolidu.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/65770868485.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/latedapa.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/soberedunowib.pdfIn PDF document text
    • https://andhimazhai.com/images/files/bemonawenobonopodupigebif.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/kanedidobalazolemotoxa.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/vakipeb.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/36574120087.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/fumad.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/fovisanuzitunojafejok.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/71637521693.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613413e47fbb1---xixeretupogiv.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/nituferiwolavuvoxur.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161529420a4fa1---tetibetusu.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24581051020.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CA 17244 bytes
SHA-256: 49cec3c981f1cf33ebc746429df74d5eaf6077e68b976e3c2974c8265ed68a23
font_01_sfnt_off0000ddce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCE 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_02_sfnt_off0000f4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBE 10580 bytes
SHA-256: b4c08e978ae0f28e97b5184beba7f0a15e554c33103fd189e9465fef95c0f5d7

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