Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c453834ffffb06a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-13 05:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7fe2ad89a5f9bba60b0f70c9f1a728ac SHA-1: 8f16b4b542f28dcbb8d9b862258ed3fa0e2c7489 SHA-256: 2c453834ffffb06aad88cf4a385cdb3d85f7fe97939a544a35b6fc3f36a047b3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. The presence of JavaScript suggests it is used to facilitate the redirection to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://krisoc.ru/uplcv?utm_term=data+not+connecting+on+iphone PDF link annotation
    • http://studioturina.com/userfiles/files/28085782253.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/wujin.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/1672014269.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/nekupusivetobu.pdfIn PDF document text
    • http://samwha.com/upload/userfiles/file/71332903678.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/50474784800.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/28979722007.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613688f31cbd9---zenemizedokegulunifadon.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210910163124810386.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/zemeza.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/28429706392.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/meraxasevidoxoge.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/vudodukeliwofo.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/41527983945.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109130722534495.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/ribofe.pdfIn PDF document text
    • http://boldogelet.hu/media/76362127589.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/95652154484.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/45486765355.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210911_050210.pdfPDF link annotation
    • http://badaranquehablar.com/userfiles/files/6787275490.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/xigagujosefaribe.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/surifunir.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/11278765540.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/xidixuroritawuwovupesiz.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/86351127627.pdfIn PDF document text
    • http://orderkai.com/uploads/files/gewabamibepubugum.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_off0000dc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC27 18528 bytes
SHA-256: ed1ba31ebbbf16a1c6a8f5349b2ee65d531c277b4771d0ddb05fcaa0e67c5a6c
font_01_sfnt_off00010c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001241e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241E 10340 bytes
SHA-256: f8bf0f75ebd30d0f539d5601cd39eb90e3a5d62e2e4fc14a23197b7f0bd6cc34