Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd6000c5cf1ce3e…

MALICIOUS

PDF

79.2 KB Created: 2021-09-20 11:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dbb0d353b2d682ff2251c344cfd30815 SHA-1: 8a2edba7aff541cc2ad520b62d6cb6f730fa88fd SHA-256: 9dd6000c5cf1ce3efd4126eab1cffad8c0d15eaeb03b9340c650d019ec4c126a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself is also flagged for containing duplicate objects, which can be used to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://crewmak.ru/uplcv?utm_term=how+to+delete+multiple+contacts+from+android PDF link annotation
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613596cd7ee0f---47417761855.pdfIn PDF document text
    • https://seerupit.dk/assens/file/lidulatijomitazap.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/9548399474.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/rosusomow.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/93915239505.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/44915503562.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/kijubon.pdfIn PDF document text
    • http://telecycling.info/files/file/25339249964.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/tusisesojeweberixutakimux.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/voturovogavevefo.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/80137662212.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/betawivipijev.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/xumitarotaruvopa.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/liluwoxe.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/zawujilotufused.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/87015148646.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/fubitixuxi.pdfIn PDF document text
    • https://trieurodata.ro/images/file/34109636676.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/21915145375.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141ae8eb56d4---jujazolekuvofef.pdfIn PDF document text
    • 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_off0000d034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84B 10956 bytes
SHA-256: 6d33395a4cfe69198b055844fb6ad36da088c79221295bbb2ee7697859bfe46c
font_02_sfnt_off000101ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AE 17956 bytes
SHA-256: 8ce3f2cc7000921812e4afdcf7e4d5061d31e8ce1a060b9e2af3000d258cf6df

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