Malicious PDF — malware analysis report

Static analysis result for SHA-256 70fff524030192a3…

MALICIOUS

PDF

74.7 KB Created: 2021-09-15 21:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2d48cb6f741ac7db93e9b50ffa7351c4 SHA-1: 266019f9f2179c534eca755d6469a3af7ef41011 SHA-256: 70fff524030192a34f6fb81f5bf613f2e5f4cb6dc9b4062f4cc5d6305627eb87
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=harry+potter+full+movies+in+order PDF link annotation
    • http://gomsuhoangminh.com/app/webroot/uploads/files/70849735791.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/mozefi.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386b6098451---353687327.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/11782572638.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/33820854898.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/3119156120.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/74490625214.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/mepefinitunelamek.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/fofidomazevezeruguwup.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/fipow.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/sazijunek.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130cf0d8e7b4---newugapujufeva.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/tadopediwido.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/butoxivoxagu.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/91799048707.pdfIn PDF document text
    • https://socardan.com/userfiles/files/muxogesudazizotatujazuji.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/37230120555.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/98600353999.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/27132020486.pdfIn PDF document text
    • https://flyags.com/editorResources/file///rogemis.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/34373378236.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/jisutobeparexoj.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_off0000bdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB6 17568 bytes
SHA-256: 78be19b194608edffc1170512cb07362eabeead3c354b4816c334f918a98d649
font_01_sfnt_off0000eb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 10928 bytes
SHA-256: f551bf4490d0beda1f75c5a853542561a90761a3c092a7e5a9247a97a0c0e40e
font_02_sfnt_off000104aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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