Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1676b49972e408f…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 18:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 414b0873658641a881e538e1ca31b9bc SHA-1: be8d228869822b605b5382d2b72343917b222576 SHA-256: d1676b49972e408fa88359aa1d63b783af68b386dad0b6bbcd8efd1c27f19a23
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=how+to+make+a+moving+lock+screen+android PDF link annotation
    • http://satunatc.ac.th/ckfinder/userfiles/files/nitujetala.pdfIn PDF document text
    • http://rs-entp.com/upload/file/97352451394.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/velolurelidonutivul.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/gobilowumeredokofazogowa.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/89266158577.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/jisutoxubewowozekedizosen.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/27763446977.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/zexinifi.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/31914857941.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/81166843609.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/guzunuboganeri.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/31759361567.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/b306883967068e8bb9ce33f6ae827b56/kimipadodobodosowu.pdfIn PDF document text
    • https://superpart.com/files/vewapegit.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/bogukirim.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/25744577663.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/60135538639.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/20019460782.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/62111055321.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/toxulezomiziveg.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/c5ddf512c2a7c601f6225d707727b32b/rerotixe.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/5783901907.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/52516731239.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/23980215500.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_off0000b29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29B 15172 bytes
SHA-256: 936e01993bcaf5c4af1b5e6f45406373780e2f5b7a7158a35379432895865f9d
font_01_sfnt_off0000d881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD881 10948 bytes
SHA-256: a26dd0b1e6795952e486fd7a8ee2d21d076858273f9ed26d4fcec00333b12fd5
font_02_sfnt_off0000f1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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