Malicious PDF — malware analysis report

Static analysis result for SHA-256 f70f45ac4c7acf70…

MALICIOUS

PDF

68.4 KB Created: 2021-09-28 06:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2bf99ee758221c910829d2d4443a2338 SHA-1: c9e336dbbbe4032a3eb070ef824d94cc06fc64ac SHA-256: f70f45ac4c7acf7092b112ef382ffd53b59c33c54a8a6df03d68181ab73f5cc5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable domains and utilizing UTM parameters, strongly suggests a phishing or link-farming attack pattern. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially harmful external sites.

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://huntic.ru/uplcv?utm_term=far+away+tab+nickelback PDF link annotation
    • https://tepatsasaran.com/contents/files/rimezekafutarozamex.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/putevibirutosatiturefe.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/geieub98kd1bpka6amacp6sec0/75577027661.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/11980290944.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/jumedabewovasuloj.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/49929653528.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/97836458384.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/xiveraxigorojovakomi.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/rebadadolimibaxezebuz.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109121233449072.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/jabog.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210905_D0BFEFEA8A2F8836.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7663d5127b95ed60413d7611074655a1/fowodanukimufexuzilevobe.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/84408349664.pdfIn PDF document text
    • https://sanmuabandoanhnghiep.org/images/content/files/gijegonedisopusakawobemuk.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/41777731486.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/57877257076.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/35850300452.pdfIn PDF document text
    • http://xenangheli.vn/public/files/mebifef.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/jivipipuwemaximulepizevo.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1632024214GbJ8.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/24352435352.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/83604019541.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/89573506981.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/jimezujaxikaves.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_off0000aecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAECF 14864 bytes
SHA-256: 2f839f763cdfa18e5f2b4d76956e90522a2d8e50e2dd85fb2c88c77858202529
font_01_sfnt_off0000d464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD464 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7B 10344 bytes
SHA-256: 61d0dff3ec5ce4bf26f7d755c8924885fb8fb24787dc1fca9f601528aac187ea