Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc9a9a04fad84fd…

MALICIOUS

PDF

71.2 KB Created: 2021-09-17 02:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e9f71e231181eed642f64fc29a065bee SHA-1: 19697409eddc06ea034fceb0f9f4e4d7157a5803 SHA-256: edc9a9a04fad84fd822d8bbff2a8d50b37115eaf122d92fe43385f0a04958163
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to other PDF files hosted on various domains, suggesting a link farm or a distribution mechanism for further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate a likely attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://mfahk.com/upload/files/94220667039.pdf In PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/diwemefovodewemipuku.pdfIn PDF document text
    • https://satesayap.com/contents/files/nadagubuda.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/44382247408.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/84416151174.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/33955153636.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613daba685f9d---tirazutadav.pdfIn PDF document text
    • http://workontext.ru/media/file/selanavonunisezupem.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/winepojisoxiturokudo.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/namasirafidererozepa.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/mikagetiranejukemuv.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/18448989807.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210901_102440.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/rugebupuvoma.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/79118286559.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/40142306898.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/42274470939.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/nomodiradafu.pdfIn PDF document text
    • http://teresachild.com/upload/files/85863212256.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/pozemusatevuzolabat.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/pidazodukobumagux.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/pemuwovagefuw.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/gukozulozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=critical+ops+play+onlinePDF link annotation
    • 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_off0000b69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAF 15984 bytes
SHA-256: 339d161236e1a12d448b75d9ca521aca98ec1be96f0d2eb398de7ecd39e667a9
font_02_sfnt_off0000f76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76D 10512 bytes
SHA-256: e77dcd192292318ba940562cef9e8a76298ebd2bd73c5d61e20053bf147684e8

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