Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9556cfd32d12670…

MALICIOUS

PDF

75.0 KB Created: 2021-09-23 07:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d4e91e5be65ad683004f9a802011107f SHA-1: bcfd5a1511f38813992ecb10f537f25df432ad52 SHA-256: b9556cfd32d12670917e7aba71d555037ef7d6a5d7b622b09fdb795553e2b29b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, strongly suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://garglob.ru/uplcv?utm_term=free+download+mp3+video+converter+apk PDF link annotation
    • http://hophungvietnam.com/app/webroot/uploads/files/xasexap.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/15341928301.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/41326369619.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210921211824.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/bofupatelopubiseluluwaje.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/81636426077.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-5/20210905051548423120.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/zebiv.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/pavopufinuvovujoxot.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/86418633226.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/57159404338.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/dazowibuforatawonegilabe.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/pesipowaruro.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/masalale.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/17341196694.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/kanesipikowuvefoko.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/resumamasogeresemiju.pdfIn PDF document text
    • http://fohow77.ru/upload/file/26139851919.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/gozupuzizizul.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/fazeburifalawefakegated.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/59647764417.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109090655062931.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/87429512751.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_off0000beec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEC 17580 bytes
SHA-256: 8c04b1069e9e7cff627f62058aa6bec8df9fa2faf037738b617106271b1c0775
font_01_sfnt_off0000ecbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBC 10900 bytes
SHA-256: 458190a17bc66e341083c4fb60c8d244bcaf33e7df7468c9067ceddedf18117b
font_02_sfnt_off000105fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1