Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6be45d9003ff1fe…

MALICIOUS

PDF

82.0 KB Created: 2021-09-12 14:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b80ec555ea9e1aef004cbb93e3ccf581 SHA-1: 5191c29234cd2f3dbcea640ca112b70a9eeafcda SHA-256: a6be45d9003ff1feddd4684458519b9fae331691efcf44d69ac7fc8ded87c1b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to unknown domains, suggesting it functions as a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a potential tactic for distributing malicious content or redirecting users. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

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://paradisetnl.com/FileData/ckfinder/files/20210910_5D0383625CAEB598.pdf In PDF document text
    • http://sgd42.ru/userfiles/file/53911278333.pdfIn PDF document text
    • https://olterus.info/contents/files/69476684666.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210906_E3C106C9E6C34273.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210907050030217540v75kko81krjv.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/64256891927.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/66595450785.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/fefef.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/38892019578.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/73908714084.pdfIn PDF document text
    • http://cissi.it/userfiles/files/76540015036.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/97986435612.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/0dd4d4.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/morimalefojuk.pdfIn PDF document text
    • http://only-svet.ru/upload/files/xifad.pdfIn PDF document text
    • http://homeopathyhk.com/files/1206761887.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/40294227622.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/bimulix.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/26462647843.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/aecc98714c9da314b941454b673a6b52/puvase.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333214c2456---80734398582.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/patogubigiredek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=appradio+compatible+appsPDF 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_off0000d71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF34 10692 bytes
SHA-256: a18a80decf9193c8303b805c95c29a897d518d54555411626985bcb1f97ae085
font_02_sfnt_off00010786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10786 19620 bytes
SHA-256: 069b252231523471ebbfe2d31dcdd9a39d0bcbc5810670f0b01b26df53caff49

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