Malicious PDF — malware analysis report

Static analysis result for SHA-256 488b9c68e31a6eb7…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 12:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ad3cae1e7ddcc4150a3f06a83665e62e SHA-1: d09b6223c4914519eb0c9d6915fabcb369464f1c SHA-256: 488b9c68e31a6eb7664cba425f1015ff59e43babbd662ef17d0522618acd2194
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. It contains numerous external URIs, with one specifically identified as part of a link farm on disposable hosting, suggesting a phishing or spam campaign. The PDF structure and embedded content, though obfuscated, are consistent with malware delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://drafthe.ru/uplcv?utm_term=filmypur+bollywood+movies PDF link annotation
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161353f0440cdd---fisurupevuxikonuwejir.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/ranotebufogukotenogazun.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-03/210903135600557736do3pgnczwkjx.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/rotitow.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/79457069122.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/nezisabupefinotefetotob.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/41829570470.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/43805510867.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/ranisamilorajaxugufolo.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/20555700799.pdfIn PDF document text
    • https://riwg.in/userfiles/file/satasi.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/44753049015.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/50945304676.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/b2da924a06a7b69847644fc5800be07e/74819024271.pdfIn PDF document text
    • http://jarosi.hu/files/file/xezumizerodanubeluv.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/12121334885.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/wiloz.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/mopapefajifuxagevuk.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/9923809588.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/79431459819.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/47204329920.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/wezel.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_off0000ddca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCA 10672 bytes
SHA-256: ef1a09093803f7db79ece4cf758c5164640e2d0befe3c5b8fbb567932dbfd1a9
font_01_sfnt_off0000f5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FE 18996 bytes
SHA-256: 9c109541ba5f5a2c9575fe758342e1a94baf9d2d480ae337a930a3212924585e
font_02_sfnt_off000127b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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