Malicious PDF — malware analysis report

Static analysis result for SHA-256 797c0e6d74d7d721…

MALICIOUS

PDF

78.7 KB Created: 2021-09-22 17:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0b2d9e8ed1ddb07a1a1b4704964cdaf4 SHA-1: be422664b0f2a057ce4fb81c991665672abe9b5c SHA-256: 797c0e6d74d7d721932e27b86e177ca201581841be27ef43db810912324a84fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites, likely leveraging T1059.007 if any JavaScript is present within the PDF's internal structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://mn-print.ru/ckfinder/userfiles/files/zonewudufinaxeromuweleva.pdf In PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/bofuzajepapodezuw.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/tevamorajeweraruwomovima.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210922_D3EE9196517F1B88.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/tirubi.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/kazivabowigusutiwob.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/riboditagugizaz.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/94265389824.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/wivudotusagevixuzowasevu.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/85414339052.pdfIn PDF document text
    • http://centronegozi.com/public/1889146643.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/22018989630.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161463e45ed905---xelur.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/xalafokolokufixabajinine.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/napejekowozowoder.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/57758582785.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/29361686228.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/70552539981.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/nupajumawezirivojulerel.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/6q9e49361g1det577m3hbcuikk/tobizawejo.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/bewejulunanamopekowuma.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021092013350018.pdfIn PDF document text
    • http://chengzechem.com/upload/files/zumeguganofisuxida.pdfIn PDF document text
    • http://vizcsap.hu/files/file/45253714922.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133d54e451a8---64055418993.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021918_33112_317.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/85411313308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=chal+mera+putt+2+punjabi+movie+watch+onlinePDF link annotation
    • 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_off0000cdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF1 17460 bytes
SHA-256: e05326ebc8fba95e1c2661aeb534104bb02c4b99fde3255f98f45385d0a239eb
font_01_sfnt_off0000fb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 11144 bytes
SHA-256: 3daad7bf02ca262da57e86f3f52402ac7745645015fd1b524759a1c5b9d4a02b
font_02_sfnt_off000114c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1