Malicious PDF — malware analysis report

Static analysis result for SHA-256 d70f3d4fc3b55f38…

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 14:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0674fad63e0346cc6870b0c75d0858c1 SHA-1: b33ba435a203b7f2c3ee44e690862fbff8977c68 SHA-256: d70f3d4fc3b55f382a394f041820cf4d1d69d56026bd708c7ba4a79d9074c9fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161471ba33efc1---ledukesuzo.pdf In PDF document text
    • http://hoigolfbinhthuan.com/users/files/vixep.pdfIn PDF document text
    • https://gdaniec.com/upload/files/xagor.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202195103279759.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/11002175946.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/mikusinutogavix.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/83229538886.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/gejewamom.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/wojenib.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/tagewiweb.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-10/20210910221141661453.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/morelevafoxizosetava.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/xakowanafeg.pdfIn PDF document text
    • http://ashioke.com/images/library/File/bagazoliti.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/5058871256.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/delupapikigotesasa.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/jirugusurulalezubiraruz.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/48940892086.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/kogirexukajusuwegokamupa.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/76165084614.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425e045f397---pajanupinesube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=robot+shooting+gamesPDF link annotation
    • 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_off0000dcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50D 17156 bytes
SHA-256: 3acdc154f73ba17a72bb8ca2d0623fc75cccbde54f48d991b658753b5b7ba467
font_02_sfnt_off0001214c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214C 10596 bytes
SHA-256: 47d8a511003264edd5ba2019668ddf7eb23178abd0d7c45ef8a4e5b848fa8d91

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