Malicious PDF — malware analysis report

Static analysis result for SHA-256 e44f77210cc8fa27…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 01:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 75a0bee1a18b23a3f38c74f2b45ec34f SHA-1: 1cb9ef6f8d6725a3fa5b562111de5ede160343c9 SHA-256: e44f77210cc8fa27a1a45a1f529797d350993596de3bd1a9c620300e769b0dc5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, many of which appear to be disposable or link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and the 'link farm' heuristic strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://smidgel.ru/uplcv?utm_term=make+video+size+smaller+android PDF link annotation
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6f1a915c0---26525056185.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/64393634288.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/35842117843.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/gefegaw.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/wezen.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/28003566331.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/xaxazulu.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/mabaforegaxiximaroloz.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/50611656166.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/nolexuwujujunozoburoxax.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/14244090618.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/41129050500.pdfIn PDF document text
    • http://mega.kz/media/upload/files/xixosijamu.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/fudegigafalupodanasa.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/51ot4i555q93j9i1hvmf22eij5/tidokamagula.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/ratisitaromiz.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/dodegiralelepupe.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/xapadi.pdfIn PDF document text
    • https://advik.net/userfiles/file/44534346451.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/76416393503.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/rewukawenasokewetubuf.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://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_off0000da74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA74 17708 bytes
SHA-256: f16df0099c2556ae6efbb39b513e5f01fb471438106cdcc6b913c5008a5f0fb7
font_01_sfnt_off00010878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10878 10524 bytes
SHA-256: 9b7d9578df1c4b75efaf6c721bb099d1c3f7d484e75ae506f91e7b713421e005
font_02_sfnt_off0001206c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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