Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9935b202bb10406…

MALICIOUS

PDF

89.1 KB Created: 2021-09-18 04:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fffc3b2910a52911efc7d3f621efb40b SHA-1: 8605ed2278710b670dcb89dfda9516c6ddfbab14 SHA-256: c9935b202bb1040661d71ed1ed34f14463f6bc9acd162f2639c8194a0ebf83cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution campaign. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating the PDF is designed to host many links on disposable hosting. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=word+nut+mod+apk
    • https://afra24.com/basefile/afra24/files/dujum.pdf
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/40020441481.pdf
    • https://svltv.in/userfiles/files/38895645787.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161399c6b9abb8---mujezugubitajovoliboj.pdf
    • http://fsoa.cn/userfiles/file/84496409576.pdf
    • https://kentacademymiango.com/userfiles/file/1936318105.pdf
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/40595836617.pdf
    • http://nhadeptannguyen.com/uploads/files/kenovofo.pdf
    • https://asiantms.com/ckfinder/userfiles/files/31353606274.pdf
    • http://isagenixmakessense.com/ckfinder/userfiles/files/44888910182.pdf
    • http://xn--aknmedical-yub.com/uploads/file/56984979377.pdf
    • http://hungthanhauto.com/luutru/files/rofevenamu.pdf
    • https://unicon-msk.ru/data/files/85615601330.pdf
    • http://homelife-superstars.com/image/files/91628946192.pdf
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/24015079739.pdf
    • http://faradbox.pl/files/file/88191792278.pdf
    • http://wildpflanzen-planung.de/file/91820291850.pdf
    • https://avukat.dnsaktif.net/upload/files/jufabamuvuk.pdf
    • https://himalayanwanderer.com/himalayan/userfiles/files/wemef.pdf
    • https://movingalpsfoundation.ch/userfiles/file/37277921280.pdf
    • http://dytac.hk/userfiles/towotufazalunesadibiz.pdf
    • http://xmzhj.com/UserFiles/file/98704668378.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa782a035c---18353903859.pdf
    • https://crcnueva.naturasoftware.com/uploads/images/files/dumewukezebopogesugenovu.pdf
    • http://tangiahoang.vn/Images_upload/files/64212053372.pdf
    • 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_off0000f9a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A3 16792 bytes
font_01_sfnt_off000111ba.bin
eb3c4ceacc6e03dddf92598b2313506f14f61dc903601107e53d65799b63fefc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111BA 10300 bytes
font_02_sfnt_off000128e7.bin
c33599e6c30fbb6498cd339a6aec333eb969b695a13b6019a9130fdac2dd5a24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128E7 17576 bytes

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