Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ff6cfc1ff6dd25…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 00:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07b7a481956f70688e9c857e38676db1 SHA-1: 7815564c18ce425472da24dd73898191eee7a283 SHA-256: 91ff6cfc1ff6dd252c5093c3d78737a60c2bc61b0112d57dc8e02b1273cf64dd
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous disposable domains, with one identified as a potential redirector. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://mystruggle.uk/indigo/ckfinder/userfiles/files/58203559610.pdf
    • http://lycee-elm.org/userfiles/file/bovasibuteridamurada.pdf
    • http://morakothotel.com/file_media/file_image/file/xorugitoraketifivoj.pdf
    • http://kliknetezde.cz/admin/obrazky/file/kuxisolivafagupoxemu.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/62669539712.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3af3a844c---nataluluzefirefazudewebox.pdf
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wudufemuvobumagesazowu.pdf
    • http://beauty214.com/uploads/files/202109200510348066.pdf
    • http://vet-spb.com/userfiles/file/59939290379.pdf
    • http://www.taxivanclass.com/uploads/ckfinder/files/88599899702.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16130d5a4a4c3a---kamiwiwikoxiximuxezuju.pdf
    • https://tdfstore.it/file/11498852626.pdf
    • https://psystat.net/candyticket/uploads/page_images/files/96826022361.pdf
    • http://puebloexec.com/userfiles/file/49359888132.pdf
    • http://ktcz.eu/files/files/zinisolekegegopabirika.pdf
    • http://cnsgafgl.netsociality.com/upload/files/dipugonexotavagamutexipe.pdf
    • https://ritascreation.com/userfiles/file/zoxogekuro.pdf
    • http://nuuts.mn/uploads/assets/xazoz.pdf
    • http://sushiosushi.com/uploads/files/31926580716.pdf
    • http://rmgoals.com/userfiles/files/76574953423.pdf
    • http://webursitet.org/Files/file/jexubasideliriwowixoji.pdf
    • http://shangrilatheshow.com/ckfinder/userfiles/files/97504232626.pdf
    • http://mertcelikkapi.com/userfiles/file/78037775642.pdf
    • http://www.deco-interieure.com/userfiles/file/gasakarepupodetisex.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/lurenoximedekopulume.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=zen+bound+2+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b177.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB177 16792 bytes
font_01_sfnt_off0000c98e.bin
48280fe66d7066bd1557cbad3d65420515ab3e3461d8e377fd953af96e64a094		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC98E 10252 bytes
font_02_sfnt_off0000e0b5.bin
c21397add6d23dcf210878d4447dfe0ed95e00815ee0bf0b413629f622dc3440		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B5 16320 bytes

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