Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3cd4fbbf634393f…

MALICIOUS

PDF

75.9 KB Created: 2021-05-12 22:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2ca1e2c2161e33e4a622b79365b31d70 SHA-1: efb806c7ac548aef497c779722bdb38e41df64cd SHA-256: f3cd4fbbf634393f2815d7600a3b7feee2b06b127f95e406872ba86ca6d3d1ea
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ponafet.ru/strik?utm_term=samsung+un40j5200afxza+stand PDF link annotation
    • https://vuwisirikufav.weebly.com/uploads/1/3/4/7/134765545/3df4580d3ae7.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/pusuweturujasisi.pdfIn PDF document text
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/dexefozajab.pdfIn PDF document text
    • https://pudibapajupi.weebly.com/uploads/1/3/3/9/133986481/d0fa7d2dd.pdfIn PDF document text
    • http://pubopogebam.22web.org/8859239624.pdfIn PDF document text
    • https://fumevido.weebly.com/uploads/1/3/0/8/130874276/gugozuxanexuvazebiza.pdfIn PDF document text
    • https://samomalekadoj.weebly.com/uploads/1/3/1/4/131438786/kuxojuwewuxipixal.pdfIn PDF document text
    • https://kifosaxuwaf.weebly.com/uploads/1/3/4/0/134016965/bd8ae2c5d93af1.pdfIn PDF document text
    • https://genovaxoduw.weebly.com/uploads/1/3/4/3/134388418/3069723.pdfIn PDF document text
    • https://pikiravu.weebly.com/uploads/1/3/4/3/134347639/8399202.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jekurur.atwebpages.com/perav.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/neburodezevupumin.pdfIn PDF document text
    • http://timojodabemisux.myartsonline.com/animals_and_their_baby_names.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/75760343043.pdfIn PDF document text
    • http://medexode.atwebpages.com/91669447564.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/fasolujimivipoja.pdfIn PDF document text
    • http://xuvagakinev.rf.gd/south_movie_new.pdfIn PDF document text
    • http://xutomonil.rf.gd/jogefew.pdfIn PDF document text
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_cfd75f55bf4e4fd69af15bf5d6f8a187.pdf?index=trueIn PDF document text
    • http://nodufezazu.epizy.com/gakotoporasid.pdfIn PDF document text
    • https://3e206333-d6ff-4be5-a246-6289f7259d3b.filesusr.com/ugd/973a7d_353d53017fd5474493db80aa878189bf.pdf?index=trueIn 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_off0000e7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E0 5880 bytes
SHA-256: ce826e39088311973075e4af0e49f7298403dd09aa64b1b86839ced810319c5a
font_01_sfnt_off0000fbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF7 11184 bytes
SHA-256: 881ec379e85440af337f096c33575ab72c42df8907bf92eafc7cb50d1b750c3b

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