Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16b59b6d881fa48…

MALICIOUS

PDF

74.5 KB Created: 2021-09-20 23:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ac79b0ee9ad20d8a0d1ec122678e24ce SHA-1: caee48bcf8f787792bb857bc7405d9a1b5230384 SHA-256: a16b59b6d881fa48e859f8f531f5b8d5b87895d7531bba45ad0a86c4ff92ce55
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured to appear as file downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of distinct hosts and links, suggesting a link farm or SEO manipulation tactic. ClamAV detection and ML classification confirm malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://datatech-int.com/userfiles/file/rixevasutabuja.pdf In PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/66871158973.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210914135556_1730445794.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/70873659886.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/77753299103.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/q9h1ea30nro1v8gge4kup740n7/41014434867.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/ruwuboteruna.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/5931707970.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/famezuluba.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/zixipedidulo.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109182231416192.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/3660958947.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/giwopegeluxabaleleboj.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/guxanonikone.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/fitupetezeripawavif.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/zoxenaxevezewupeve.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/faniwumabuba.pdfIn PDF document text
    • http://workontext.ru/media/file/200663258.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/74532788674.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/12164624491.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/laxapok.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/befolowo.pdfIn PDF document text
    • https://sapthagireesyathra.com/userfiles/file/29794023992.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161302f70832c0---46763539413.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=hobbs+%26+shaw+putlockerPDF 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_off0000bfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCE 9492 bytes
SHA-256: f404654d557045774c854f5ff1be7cd65276e4816e93a7ff13402b777a67481d
font_01_sfnt_off0000d42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42C 18796 bytes
SHA-256: ab32501226f8e98e890dee550598c6b79a64f342fd97a1193cd91767a73d01f8
font_02_sfnt_off000104ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1