Malicious PDF — malware analysis report

Static analysis result for SHA-256 00a4232f32d32219…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 21:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 081864b9e33d6ff8649ed0a248fa010d SHA-1: 7cc3cee48eb09aa7783c8414f687190368b48570 SHA-256: 00a4232f32d3221987311f5e02980aba590e0b8178e069e91b4c314e01e09d36
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=happy+wheels+3d+download+pc PDF link annotation
    • http://thietbikhachsanvinhhung1.com/upload/files/ragovifugovub.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16311145080.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/54370511249.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210903_3D13882504A90787.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613075c3838a0---47397673044.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/xadejisupamiz.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/niserinogubimepu.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/21799158153.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/98301995166.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/11274579732.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/47877371876.pdfIn PDF document text
    • http://dalaichau.com/files/zisijidesa.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/vaxigugepovududukalitirad.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/65011534517.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/mawoluzapo.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/72798550770.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/sodevalakawetakolu.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/81278449052.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/rewogenapapitume.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/zukixetilojozukekopexuzor.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/39722237315.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/topozatiwebituvolowinidu.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_off0000d462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD462 10684 bytes
SHA-256: b830049bcd187d0bf6b80031454d6b62d51adf39b06e742b49cbd432aa9e19d4
font_01_sfnt_off0000ece7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE7 17456 bytes
SHA-256: bbca7dbeedf782d7c5588c0df85dd0dbab14ed62400cdeecedb1efe3d0464454
font_02_sfnt_off00011a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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