Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd00d4fda045040…

MALICIOUS

PDF

71.0 KB Created: 2021-10-03 18:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7dd985c7d57db224f33b2f0aac743499 SHA-1: 0823ab7d89b0f5c5b5cc6af2ab4af779e0173bea SHA-256: 8fd00d4fda0450403dd8fa6b4cd0b6c3548b175ede8871cc042f23c354f38456
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to potentially disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were extracted, the presence of embedded URLs and the link farm heuristic strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://driver-jazda.pl/upload/file/zuzexajigeroxatituboja.pdf In PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/58437055434.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/57633248421.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/81200539659.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/jagegifusiruwat.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/21426440568.pdfIn PDF document text
    • http://xn----8sbkebltdkywd.xn--p1ai/ckfinder/userfiles/files/vajebalavemar.pdfIn PDF document text
    • https://acmfashion.vn/uploads/files/dejoforowobuk.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/vorowisaru.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/jomewo.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/51973087242.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/towavisuwajezogifiwez.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/84345656472.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/48787834554.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/sixizanepirobopumixaga.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///tabuvizimi.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///pedobarasizo.pdfIn PDF document text
    • http://jump360.co/upload/files/20210920053829.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/gososawapivaposuba.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/verozuxoposejureminuve.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109091931221985.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/97371622977.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/26048894683.pdfIn PDF document text
    • http://xhzhengli.com/upload/64673439926.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/29094941092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=professional+summary+for+front+end+developerPDF 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_off0000b039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB039 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC850 10940 bytes
SHA-256: 233cb6a8fcf57daf705fb28264b58748e8ceb7f9996d4286c00c69d7a0c69bbc
font_02_sfnt_off0000e1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B5 16868 bytes
SHA-256: b4cdba2e2f20b4575a614bec47f4b04e6ea4b1eeecdd43ffcfeb30482d1ed500

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