Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac2a62049e2776d…

MALICIOUS

PDF

73.3 KB Created: 2021-09-20 10:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0a7a8713708b6e2b99bfecc92b8850da SHA-1: ba491b3d02c3c8874f1ef16fdb1beac30a25d25d SHA-256: aac2a62049e2776d75fbb97b156a24bef43ce55b37304c56a210dae4a1b25c22
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious sites or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://wu-pao.com/upfiles/editor/files/75079221939.pdf In PDF document text
    • http://muszempilla.com/files/file/34646860005.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/93268249544.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d02585fbcd---zafonipezeferadenavaxisu.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/90333249007.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/78428865802.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/47186833152.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/gonepuziwixele.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/36882460977.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/88172792278.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16133a94b58702---fojuzixurulemegun.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/37499542367.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/2940076880.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/5231942773.pdfIn PDF document text
    • https://hgb.se/filer/file/16238970919.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/najumoxomarokatez.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/66465129666.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/vasemin.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/26091482705.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/16585831022.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/77931386362.pdfIn PDF document text
    • https://italvaping.com/file/sivutasuboku.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/3201ffb391814181390242c66efc6b2b/82525413082.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/xafikoxopaxedodunebo.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/55566937095.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/pijigavafavaxoxinejap.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/sopixukiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=minecraft+pocket+edition+mod+menu+apkPDF 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_off0000bdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCB 15892 bytes
SHA-256: 9e11531c375313b6411820bcfc169b95a4c1257b7c4fefef60b1ae775ff549f2
font_01_sfnt_off0000e631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE631 10752 bytes
SHA-256: 865ed648c856a6e8043002ce911b0bfcb0fc21acbde12ec8103c8307b3506be1
font_02_sfnt_off0000feec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1