Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6a28060923d756…

MALICIOUS

PDF

81.7 KB Created: 2021-09-10 23:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8165f2f96084621324bc61c0399508c1 SHA-1: d896c30818320ce5f059df25057e026fab0d143e SHA-256: 9f6a28060923d7569b66e203113a4729b1008d73e83732889c8c7cae859f7e54
126 Risk Score

Malware Insights

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

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, directing users to numerous distinct hosts, many of which are likely disposable. The embedded URLs and the PDF's structure suggest an attempt to obfuscate malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://franchisefarm.franchiseharbor.com/files/files/34761345029.pdf In PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/jidoseros.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/televaloxa.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/5ub16v479l2gbvcrdo3un0s73o/18003186617.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/97496556580.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/47788168545.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/jatisoluzobad.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/vewemijukodajaxizixedeluk.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/saposiseralovidegezoj.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/linisuzofon.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/15917398315.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/33378009921.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/48283602357.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/jobefaduko.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/vosujoterifojerulad.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/kobigila.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/muziwewetukel.pdfIn PDF document text
    • http://grimastone.ru/files/92754326671.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/43040376714.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/foderitaj.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/87074791219.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/jeximodikuvu.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/modajotesivoxebuluxubabo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=macabebe+zip+codePDF 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_off0000dcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD2 17728 bytes
SHA-256: 9a1267539b93ea686a10491563caba3e086e7c148cbb75f8ee511afab4cb4992
font_01_sfnt_off00010b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B12 10184 bytes
SHA-256: 09e0cd6014aae2a6faf711419182fa88e8ecfde1611c7782f80b0e9a67cc242d
font_02_sfnt_off000121cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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