Malicious PDF — malware analysis report

Static analysis result for SHA-256 1203a9cddc3cdef5…

MALICIOUS

PDF

76.0 KB Created: 2021-10-01 07:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c433170917d43d5593878a603ac01d35 SHA-1: d5859c6d1a2507aaf5301af3329bd8c09a1820fe SHA-256: 1203a9cddc3cdef58177e7c0566b1fa6b9534bce8d23f3a0c2fda6fbbf11c056
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document is designed to redirect users to potentially harmful websites. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest an intent to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=como+ativar+o+adobe+flash+player+no+android PDF link annotation
    • https://bd-sokolovska.eu/userfiles/file/mareboxewupagajusajipibi.pdfIn PDF document text
    • http://dsagco.com/Upload/file/vavema.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/80285954975.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16151bd02bbbc6---37520548155.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/56603725726.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/furafoxokudutebonufeto.pdfIn PDF document text
    • https://reha.bg/content/upload/file/80964423249.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/20/jepunilaxavufe.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/zuvexebivatud.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/xosipabijazujexorosemum.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/duxanevalivoboj.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/97075710946.pdfIn PDF document text
    • https://qematalsihha.com/ckfinder/userfiles/files/wemizatopefez.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/negesanopimelubuxatofimu.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/86136774856.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161533b98ee789---12108232717.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/jugalesidogemuve.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/1309007285.pdfIn PDF document text
    • http://didopack.com/files/90026110489.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16145146e6bc81---fazoxolamotamukugilozisot.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/57997500741.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/ginibejufojomux.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/56742587488.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/21/lurasil.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_off0000be3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3C 19408 bytes
SHA-256: 225a891010152e2aa5f5b71380fb5c72172a52183e83b908df707ebc07b5f987
font_01_sfnt_off0000f0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C2 11116 bytes
SHA-256: d85dd8732a735d99ec4a12320907dbadb53c39a786597610fd8b60c9b6bd86eb