Malicious PDF — malware analysis report

Static analysis result for SHA-256 39864c0f681c7a9c…

MALICIOUS

PDF

70.4 KB Created: 2021-09-26 01:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8dd7ca7942ac82201d4d2e8958672838 SHA-1: a335b98fd2fb6f2baf0e3abed5201864dad3937f SHA-256: 39864c0f681c7a9c47e13cdd8a597487ef5912a4b706565d728ee303e71db9c2
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. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with techniques used to redirect users to malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://eletroluz-al.com/_IMG/img_internas/file/junutawip.pdf
    • http://cleanyachts.it/writable/public/userfiles/file/38110620428.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161491799cb8fa---43434125579.pdf
    • http://master-stroi76.ru/userfiles/file/siwumi.pdf
    • http://onnetsolution.in/userfiles/file/fipaba.pdf
    • http://realcomfort.ru/content/upload/file/89305412401.pdf
    • http://mariautonoleggiomarsala.it/userfiles/files/dewuliwafov.pdf
    • http://offerparts.com/upload/files/neruparavapotewagedi.pdf
    • https://vwb.mrv-educationservices.com/content_file/files/1453690988.pdf
    • http://techniq.ae/admin/uploadfiles/file/kewerutuzonuruvagevul.pdf
    • http://htwy.com/upload/file/5622294369.pdf
    • http://coeb.eu/userfiles/files/95891821221.pdf
    • https://iqrainternationalschool.org/_assets/files/jebudivalu.pdf
    • http://www.likoda.com.tw/upload/ckimg/files/tadevowisisogejukeg.pdf
    • http://chingyi.tw/userfiles/files/lilimagiv.pdf
    • http://ibookingkr.com/FileData/ckfinder/files/20210906_CC7E3BC208EA64FF.pdf
    • https://sanagustin.cl/files/92725746003.pdf
    • http://choinka4x4.org/cms/files/file/25596801335.pdf
    • https://kit-veron.my/ckfinder/userfiles/files/bupufifuvekig.pdf
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/duboxofobiputuvopig.pdf
    • http://apismorava.eu/docs/rabivojopafadumawefip.pdf
    • https://lotte-ppta.com/beta/assets/file/68735254268.pdf
    • http://bmfjhjk.friend-match.com/upload/files/xuwekavakedinumilu.pdf
    • https://accounting789.com/ThImg/file/96596038076.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=stream+sports+online+free+sites
    • 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_off0000b170.bin
3121783550058c99edcb5cee337fa1a44149558ee644314c5d2a79f66d78d108		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB170 16372 bytes
font_01_sfnt_off0000db3e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3E 16792 bytes
font_02_sfnt_off0000f355.bin
c667b88ca6a87d81a996266e60629e169733a104ae619298e9f67bdbac7a77c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF355 10592 bytes

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