Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dddd7ce65e01fd6…

MALICIOUS

PDF

72.2 KB Created: 2021-09-18 04:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 962a79c14a514104f998744c87c42816 SHA-1: 9c85f78f3376172adcd00ba9ca128987394386a8 SHA-256: 3dddd7ce65e01fd6bb681706f57a84908959e0991c8d457f0728a70751667881
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lead users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=sm+words+phonics+list PDF link annotation
    • http://novichiha.ru/pic/file/82160379073.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/saremofiwazu.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/86336391811.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/23716725782.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/17944461838.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210909204508.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/fobetukowatamabipomekeda.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/46604116204.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161380943013ba---gimoxezipomedewafazekuvaz.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/68247993208.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161419a4ae8b2b---16809761333.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/88026740113.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/sagurupitikeviwuviwabu.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/7704920937.pdfIn PDF document text
    • http://termocity.by/pics/files/midoxesamoxalezerejebova.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210909_D9F18E8ED828847D.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/lidewetopikixuluwefovazal.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202109050914236931.pdfIn PDF document text
    • http://artospace.com/pics/file/20752925044.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/1274201770.pdfIn PDF document text
    • http://tayles.com/uploaded/81830738211.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/58875235760.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/22962107870.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_off0000b7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFB 17320 bytes
SHA-256: 10dbc60f7bcd06cb6337992459b39d4d7e278526c8f3a42165f7c5ea1ffb08a0
font_02_sfnt_off0000fbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD3 10648 bytes
SHA-256: 7a4493dba8d835a35d2be1418197214ed50db0d498986d878b7526d4080d6373

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