Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ba816ac5cd5e72…

MALICIOUS

PDF

68.7 KB Created: 2021-09-29 01:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: afed7b03ad4bbe28a6cf147cca357a57 SHA-1: c3fa9b5189d601d6eb0ab885d5a2fe41dfb481a3 SHA-256: f9ba816ac5cd5e72b9ceb7487d2d34951210458ad26a2c97f723343efc7a8982
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-based lure, typical of phishing campaigns, to trick users into interacting with embedded links. Heuristics indicate it functions as a link farm on disposable hosting, suggesting an attempt to distribute malicious content or redirect to phishing sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it is designed to exploit user interaction for malicious purposes, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://chcial.ru/uplcv?utm_term=android+studio+lottie PDF link annotation
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10842790367.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/mibabemovanipapozisezuj.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/mobisotisiwekosu.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/76770584824.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/45886555021.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/42283852142.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/naruguwisezofimawuxeta.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/gazesipu.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/15893008580.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/31568057791.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/bupilafegobomefoja.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/b350c9280aba74600067b35cd659550b/tedizuda.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1632589288_1885c14c34.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/wofoj.pdfIn PDF document text
    • https://www.iimranchi.ac.in/ckfinder/uploads/userfiles/files/92773298535.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/85522725911.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/sebejuzowepafezokinoja.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/95904974763.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/galuzosuramogovufokajikim.pdfIn PDF document text
    • http://kasargod.net/uploads/file/38363077101.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/97861850404.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f85e3b0b4a---divatejaner.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/16244112980.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/55230582684.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/pobaxiligi.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_off0000b30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30F 14156 bytes
SHA-256: 42b882bbc2efc3b23b80f51d7d0ab52da3b4fa07c7902351fd7c87d05c3f354e
font_01_sfnt_off0000d657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD657 10160 bytes
SHA-256: ea7ba8a81d55b8b09ea258c06f8a58e28da76057bb51dd0d855a58d6dbeaf8bb
font_02_sfnt_off0000ed37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1