Malicious PDF — malware analysis report

Static analysis result for SHA-256 970756d02dec89de…

MALICIOUS

PDF

86.2 KB Created: 2021-09-11 09:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 54696aad05670e19bddda9a4a18a8c5e SHA-1: 8169beca998e77a954c0ba363257a52d1137453a SHA-256: 970756d02dec89deec1508f1636518ac4c74a11a0923fe17da28ef6916862c54
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is part of a link farm, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oreopay58.com/ckfinder/userfiles/files/3342351955.pdf In PDF document text
    • https://fishboat.hr/files/94237599037.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/27467015945.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/duzoganomu.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/wegadapezuwisabasumopi.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/zuginugalomulemix.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109082153288067.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/26274155670.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/letev.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/15292761229.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/60922932045.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/kifodefiteniwegimesadasev.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d898a1ea1---79594607806.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/17546292460.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/59161794293.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/digotuwilekibawuruk.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-9/20210909122647736464.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/173463927561344d813acd5.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210902042944_1879349106.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/vibolojakutetulolegokuxi.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/bitoroduputud.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/40476916258.pdfIn PDF document text
    • https://kaparatt.com/images/File/lejoviriketuliridebevat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=compliment+starting+with+pPDF link annotation
    • 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_off0000ec74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10486 17784 bytes
SHA-256: 42120a0d341042eb39e444b3f54ec6e2ada70d30f9c25f184da0aa9d32e82a1e
font_02_sfnt_off00013234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13234 10816 bytes
SHA-256: 46bde53e5dceae81c209767451ffe1ded8b464f065dbfde32a1d795f1c894d8d

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