Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c643ffeec5e65a5…

MALICIOUS

PDF

84.4 KB Created: 2021-09-18 22:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e63d95e1ce0c17d03d5656744deb3b83 SHA-1: bd854de81feb6d73c0fbc34075807b17cb1a486b SHA-256: 6c643ffeec5e65a5af11598b3a97d68eef5c531cc928bcb80443aaa6f85aeca1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://stellarp.com/userfiles/files/16550860330.pdf
    • http://macabrey-luthier.fr/data/Files/6125207173.pdf
    • https://dom4m.by/userfiles/files/25442143919.pdf
    • http://russkiivopros.com/images/FCKeditor/file/pujarudesufalobefiji.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/fb69e30f329e65f0c4f9792c17883d04/70764408350.pdf
    • http://candybeauty.vn/upload/files/fununodatopodijuwotid.pdf
    • http://ever0036.com/assets/uploads/ckedit/files/20210901151228.pdf
    • http://babywagen24.de/userfiles/file/jisutezexagidusevudo.pdf
    • http://sbsinternationalschool.org/userfiles/file/71982166014.pdf
    • http://nelly-design.ru/upload/files/donexutubalanipirajelago.pdf
    • http://xinge168.com/uploads/files/20210902110412_708135.pdf
    • https://cmfnepal.org/userfiles/files/57425683928.pdf
    • http://ashole.hu/UserFiles/File/kotelum.pdf
    • http://dges.in/userfiles/file/18933510395.pdf
    • http://studiogaleazzo.eu/userfiles/files/10065032994.pdf
    • https://truongthanhco.vn/webroot/img/files/jipewibagipasoxizogolegof.pdf
    • https://turkuazhost.com/calisma2/files/uploads/mazos.pdf
    • https://tadimtursu.com/image/files/46590077809.pdf
    • http://itexpertdog.nwoasis.com/upload/files/62496761262.pdf
    • https://ladangmimpi.com/contents/files/40983388080.pdf
    • http://amandamaitland.com/images/file/dakegenirijinatesopofod.pdf
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/23728811351.pdf
    • http://evola.it/userfiles/files/89687305680.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=why+is+my+phone+not+connecting+to+wifi+at+home
    • 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_off0000e35c.bin
7d583c4857b9c98e1f53928dcd313b1c5e14f44086e2a6e633b61e991e1ef553		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE35C 10976 bytes
font_01_sfnt_off0000fcc8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC8 16792 bytes
font_02_sfnt_off000114da.bin
88a1f80686d37f56fef697e99255427d7bf10e3d12fd00a580f24d91504885e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114DA 18052 bytes

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