Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0f39b7026caad7…

MALICIOUS

PDF

61.1 KB Created: 2021-02-15 17:50:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e767b1ca5d0a5aac3133e1ba14f6be6d SHA-1: c3c9b6454ae66c6c32823c4bca105827948075d9 SHA-256: cf0f39b7026caad7baba571530ff83e0a3dccfa536f054de182feb8304bc5656
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of these URLs suggests the document's primary purpose is to redirect users to potentially harmful websites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/strik?utm_term=war+horse+ink+107+e+summit+st+kent+oh+44240 PDF link annotation
    • http://maska-respirator.shop/lirevekitenarikazu1zn.pdfIn PDF document text
    • https://cdn.sqhk.co/wotutovebo/Wgjgfia/45792938075.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/bDhhadU/vimolubufisuvijite.pdfIn PDF document text
    • http://magnetfix.store/check_md5_checksum_androidwa7g5.pdfIn PDF document text
    • http://dkblogin-de.best/keep_talking_and_nobody_explodes_ps4_without_vrzaau9.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/iaVjiRS/66158693813.pdfIn PDF document text
    • http://polokuvek.iblogger.org/ximaduvupizafopatir.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxarufodir/nhihfki/live_stream_catholic_mass_saturday_vigil.pdfIn PDF document text
    • http://1freedom.space/charge_apple_pencil_without_adapterodx1a.pdfIn PDF document text
    • http://zupuvotan.22web.org/reference_citation_apa_format_website.pdfIn PDF document text
    • https://cdn.sqhk.co/jigidokasaga/veSczja/stack_helix_ball_3d.pdfIn PDF document text
    • http://idealica-official-it.website/mugemalupewaxewesitilufhyx.pdfIn PDF document text
    • http://front-glass.website/46510277791d1hca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nerepigov.rf.gd/78083568650.pdfIn PDF document text
    • http://velododitimof.rf.gd/induction_training_certificate_template.pdfIn PDF document text
    • http://limepupotof.epizy.com/android_games_to_play_with_friends_offline.pdfIn PDF document text
    • http://sidunutisa.epizy.com/okhttp_post_request_android.pdfIn PDF document text
    • http://poposumezaxek.rf.gd/free_classroom_newsletter_template_google_docs.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_off0000b493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB493 5464 bytes
SHA-256: 87b471ec50097fa81e1d06bed76fb0c28d725c44b6f5c00a5abe64d0ba404f89
font_01_sfnt_off0000c718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC718 9396 bytes
SHA-256: 182059c57f7fc2222eb6faccc42a6d3cd2a488aec71a96b64cfbb4ae6c58238e

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