Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5899b761712ff5…

MALICIOUS

PDF

73.3 KB Created: 2021-09-11 15:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ccfd1a215a7da7396a96492639af8d72 SHA-1: 51961af2b56d87a37e581887d50343a751d01f51 SHA-256: ef5899b761712ff5f76ba7dccaf42089dded75442fb42985bbc696ea742181db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The PDF's structure and embedded links indicate an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=reading+comprehension+about+culture+pdf PDF link annotation
    • https://xedulichhaiphong.vn/images/news/files/492666269.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/87963916433.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/lujowekasuseresenojuvaj.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021951159358420.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/fenatenizali.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/43326691231.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/toxok.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/65576239957.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/45328471410.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/efde1273ac326d65befda4b268fb0fad/tanofilufugu.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109030747473524.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/58307850379.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/86429530949.pdfIn PDF document text
    • https://emenu.hu/editor_up/49489697005.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/mokuxenosi.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/67110643111.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/mutibewenigoze.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/supanajijuzexadif.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/vetajajutume.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/kojesimodadavomowetod.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/66153723190.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/juleza.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/13401648437.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/bafepenedopete.pdfIn PDF document text
    • http://ativn.com/upload/file/menul.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_off0000bc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC30 11352 bytes
SHA-256: e110e571f88aa5989d53484edabf7e729e2b9201a163c69ba5f57e2873bb22b6
font_01_sfnt_off0000d634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD634 16156 bytes
SHA-256: 39a2ffdf4fedd4b8bb9a4e869ce20fe0b48fcb208ed027e3869a30b77b31e82b
font_02_sfnt_off0000ff1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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