Malicious PDF — malware analysis report

Static analysis result for SHA-256 cea93d2a8073ad9b…

MALICIOUS

PDF

77.3 KB Created: 2021-09-21 12:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 83ecf5337f6cc192a076f1730ed132ba SHA-1: f43b86077175bad750cae38a6d25e0a2dc031bee SHA-256: cea93d2a8073ad9b7035252c71cf7b43f7fe482b20747850eda87b8ce744ba0d
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://fabiocaronearchitetto.com/userfiles/files/poxuwalemulilinebi.pdf In PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/65236324420.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/87039376868.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/31931774977.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/kulijinulaxefaruper.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/7331650009.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/tebineraretuvuwibesi.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-21/20210921050710214908.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/wiluxoxegodosuvu.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/kuwabevezususutoj.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/75189887782.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/xivapiboxovinozotofubu.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/99617826639.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/35694766572.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/tuditepilamiwivupafipowig.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/88497714805.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/34572820611.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/sozaxidisufevaxidejijegov.pdfIn PDF document text
    • http://onelove.cz/file/53203221046.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/15566046520.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161358c9c1a013---61460959928.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/88837227508.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/logokasasawininami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=play+pokemon+blue+on+androidPDF 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_off0000c8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B4 17684 bytes
SHA-256: 7913f1a06795221dd3428561e5f5d07eaaab830288ee8df6093898e13698c52c
font_02_sfnt_off00010f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F18 10732 bytes
SHA-256: faeabb7b95661fb44890da7dbd03f8890c60549d8b6a367e1bfc91500ee95631

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