Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9adf1d91f5a6fcd…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 13:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3f5ef9de71bf74908dcd36acc9534be6 SHA-1: 7330af8f28f7c27d3321ad7ba9dc3c44b7556e0d SHA-256: b9adf1d91f5a6fcdcd2aeb5d7f30afd5186eba6b2b423b10e5447834277fa4e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded links, many pointing to disposable domains and exhibiting link farm characteristics, suggests a phishing or redirection scheme. The document body was unreadable, but the heuristics strongly indicate a lure to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://unitec-egypt.net/userfiles/file/800418999.pdf In PDF document text
    • http://planet-for-events.de/userfiles/file/diwenivetokefuxajamu.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/fugopelilapozumisiv.pdfIn PDF document text
    • https://bak.vn/upload/files/63968499308.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/43350565030.pdfIn PDF document text
    • http://inercial.es/uploads/files/97919399425.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/07/file/53890938521.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/nadoxokisojikajaxasojurug.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a6d6af974---62460781322.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/norogejejata.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/72163327715.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/jemireta.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/gagimepekisume.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/89329771678.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/a69c3560869834bce571bd4915582e14/zerewig.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/lipawizodosota.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__61374F47D6B28.pdfIn PDF document text
    • http://exim5.hu/_user/file/pijosit.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/vujexi.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/88592151343.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/kupabozil.pdfIn PDF document text
    • http://espwireless.net/uploads/file/lelobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=play+store+android+installierenPDF 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_off0000d559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD559 10356 bytes
SHA-256: b9108a11e4d2235e084a8239516f0dc6c2df7d78aba812abbfdfcdc67915a211
font_01_sfnt_off0000ecee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10500 18192 bytes
SHA-256: 6b15f12c945f4454ea39d450a3ebd3512642f02ae038b7eb27eea60640f6d52c

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