Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3a52b1679e5da3…

MALICIOUS

PDF

76.9 KB Created: 2021-09-17 22:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 30530729c591c6dfb6b9e5d381034102 SHA-1: 17de9ff9a9e52b0805e0402b821e26337f7f28d8 SHA-256: cd3a52b1679e5da38bbbb8b6cfdbbe18eedfd41a4b6d00d4c1934a8f6cbdea0b
146 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or redirection scheme. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and URL distribution are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://archism.ru/uplcv?utm_term=world+of+warships+para+android PDF link annotation
    • https://net-mex.hu/ckfinder/userfiles/files/naxosebekonaruzenami.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/ravuperumugu.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/xububasipirumopa.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/diwozulojijoboja.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/74252654753.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/bubinevol.pdfIn PDF document text
    • https://pindimana.in/uploads/file/52827476714.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/worutaxaguxotefusowosi.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/5080163152.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/xorasosevetawujefalamel.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/30960845384.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/69781036864.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/keratuperid.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/16784236662.pdfIn PDF document text
    • http://4rrecycle.com/files/file/76835197631.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/2kb1sgd4kqcg7cnca9773n0nc1/xesos.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/rorovavoletajixufuzurujo.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/49830767888.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/kelokefipapexugeku.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/bomilobibebo.pdfIn PDF document text
    • http://pnalog.ru/images/file/romed.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/janizogivavun.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/fibuxedonusatoba.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/37588741058.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/zeter.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/kufega.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/42782257105.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_off0000c5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BA 18936 bytes
SHA-256: 852a4b8638a73856808d2f6bb9de4f223c1a96e8065c8358842a8f70ccc06f3f
font_01_sfnt_off0000f643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF643 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5A 10444 bytes
SHA-256: f1689faeb62e0521c454f91475834903d30b93cad437cb661b801a24f65926b6