Malicious PDF — malware analysis report

Static analysis result for SHA-256 a523f7e81d417429…

MALICIOUS

PDF

63.1 KB Created: 2021-02-18 18:47:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 3ca94d517cb8bcf39606f74ca692c93a SHA-1: 8f1ac3d9aaf66c263093d61193f1d344552f6848 SHA-256: a523f7e81d4174294a2bc28a9611c43f6aee95200542b25fa54d8535d156557d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to search results or downloads, aligning with the 'Pinoy tambayan lambingan' keyword found in the URI. No scripts were extracted, but the presence of external URIs indicates an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wix?keyword=pinoy+tambayan+lambingan PDF link annotation
    • http://appless.space/primavera_p6_free_download_full_version_with_crack_32_bitzh765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422909/normal_600bf237a9183.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/iahfdMp/download_wallpaper_sword_art_online_alicization_hd.pdfIn PDF document text
    • http://sfhgfje5df.xyz/876109038211ns0q.pdfIn PDF document text
    • http://fishland.store/patellofemoral_pain_syndrome_manual_therapyo33t8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426413/normal_601b230428883.pdfIn PDF document text
    • http://giocodigital.fun/paduvare6ini0.pdfIn PDF document text
    • http://esclub.pro/kipadiperifawaregfjq8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459796/normal_5fcbf2b4ccdd1.pdfIn PDF document text
    • http://shoop-fh.ru/winuxopiwoxigupegowenilaphm1lm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bidivo/lady_bird_lake_bass_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/proving_congruent_triangles_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/videoder_apk_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/marketing_operations_specialist_interview_questions_and_answers.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD95 4976 bytes
SHA-256: ed239425d84f1fdc6723ae675a757b4cd7eb209517c5fe26a9b0bd367b65282a
font_01_sfnt_off0000ce7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7E 9780 bytes
SHA-256: 1c5f046c7df2a0d6c665c6c859057a58d52c6d98d68df5b125ea0ae5ce10e05d