Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ec39f97d57ba1a…

MALICIOUS

PDF

82.1 KB Created: 2021-09-13 02:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fca3d2bab29d1e49fca42bbc5c8cae97 SHA-1: 6f3a8b50a50c462c1789a72e7698cd966d8a12ab SHA-256: e7ec39f97d57ba1a2444a190c7ee786dcdb3eb155b6cfcc0cf5eb7abb255962d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, embedding numerous URLs, with a notable example being http://tt-ural.su/admin/ckfinder/userfiles/files/fosugogezufonufij.pdf. The presence of PDF_SEO_DISPOSABLE_LINK_FARM suggests a deliberate attempt to create a deceptive web presence, likely to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tt-ural.su/admin/ckfinder/userfiles/files/fosugogezufonufij.pdf In PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/72374069717.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/lafulate.pdfIn PDF document text
    • https://dintek.eu/uploads/file/dudaduzirunizujufukifo.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/vonosemivutemu.pdfIn PDF document text
    • https://afayl.com/userfiles/file/20822671140.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/94a2f841390428e41f4f7bb127705fe8/mepefiwa.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/vasovugutofumarebugun.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/jivafizefujuleka.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/20521376191.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/55136143273.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/9254547865.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/bapipivesaj.pdfIn PDF document text
    • http://saktigroup.in/uploads/29123798706.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/92183297718.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/28492896668.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/wateb.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/78385860189.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/zususukujebobij.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/0khodu0apj263fg7pn6cu6s1ao/rufivejowoxuf.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/46348983028.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/32422469729.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/nobotupu.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/64227768846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+bypass+screen+lock+on+moto+g+stylusPDF 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_off0000daa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 11148 bytes
SHA-256: 5305e43db8e721770bd177578191063a8f3020d72f5eb1bb82a06b01c62262c8
font_02_sfnt_off00010cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAE 17720 bytes
SHA-256: ccf2f75fe20055ea313fff2e3d076b8428aaa022c80fc9b16f25af2406b6a274

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