Malicious PDF — malware analysis report

Static analysis result for SHA-256 280a67e6200671fd…

MALICIOUS

PDF

83.8 KB Created: 2021-09-16 20:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d4eaa18bf9235f1caae2fa8fb4e40d27 SHA-1: 4cecc661d273e68cd39fc899078a8b4017468b38 SHA-256: 280a67e6200671fdd90627351e44a83a31a57cd8c91d57ce89e611ec07d9628d
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 of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, and the presence of external URIs further supports this. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=redmi+9i+support+5g PDF link annotation
    • https://ymvii.com/admin/upload/files/9010760420.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090506294773499.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/mekoperi.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/50868367909.pdfIn PDF document text
    • http://52963566.com/upload/file/202109030704061798.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/rukejasipirisikovarog.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/1f6ce43daa2e2dbb36d1ef1282459e34/21545452487.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/lasovuzobalafexafufagejo.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/80881217225.pdfIn PDF document text
    • https://moolans.com/uploads/files/jilananaw.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/vudapi.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/vomivawubapozubizomufabe.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/donagizilabe.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/82877661820.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-2/20210902165552648553.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614191417fa86---97439358691.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/90339677899.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/47340620963.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-6/20210906121038730763.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/pixigogufejerenoburu.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/50282169353.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_off0000dec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D9 10872 bytes
SHA-256: 0ea0e1447ef8aff4c0e9e524a7e5374e24fce5501e94721397a1f405edb7bb41
font_02_sfnt_off00010fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD0 18940 bytes
SHA-256: b02494304d96a7d7a71f7546fc75aa2a49a835603d0931cdf3ddc62843d46cf4

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