Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d2cf1dd83bd4e2…

MALICIOUS

PDF

86.2 KB Created: 2021-09-11 20:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c4df33f7219e18d11e15617e948dca8f SHA-1: e5150ccbe72dfaacc0dfa784c9c22ed3f7e279ec SHA-256: d5d2cf1dd83bd4e28bcc197dc74578f32baa40b86fca57f6b98b9864c5839e5a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://ketchas.ru/uplcv?utm_term=renault+r+link+android+auto PDF link annotation
    • http://incomingmakedonia.com/files/files/53418280472.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-11/20210911002214261108.pdfIn PDF document text
    • https://totounited.com/contents/files/talupesonevugobumoze.pdfIn PDF document text
    • http://jfe.hk/userfiles/vevawevozuvesurikexub.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/kudulapuluw.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/buaumk1idbvc9au6r1g26imi5i/lotakufa.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/44996056593.pdfIn PDF document text
    • http://ruihuitax.com/files/file/gagobez.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/junenaturoromapizugifu.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/57336217768.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/gebonumenufufemabiji.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/55438690103.pdfIn PDF document text
    • http://pioneerbuzz.net/userimages/5452180594.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/gededudubegine.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/fazugikepogofe.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/72687304627.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/mowukolarojapifivawe.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/95955398818.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/mukakigeritowu.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/81589893529.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/12761962546.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/42226701275.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/36302971154.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133f977d893c---71896665333.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/vireropogawetex.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/fedajebafinokala.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_off0000e864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE864 10312 bytes
SHA-256: c071a5e6a445c71c3a3863095bc644e265b23630f06327548061321d9d8c4ce1
font_01_sfnt_off0000ffb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB1 19416 bytes
SHA-256: 4a3980339ae83d6c07fb41637407c79cccb969c95e55af4ebaa789565f9b825e
font_02_sfnt_off000132e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1