Malicious PDF — malware analysis report

Static analysis result for SHA-256 a409eb42bcb82162…

MALICIOUS

PDF

82.7 KB Created: 2021-09-21 21:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 72c63e6374dd9d80acf7877e17897fce SHA-1: 857ef124d15872dcbe1539f10592807e11f6a997 SHA-256: a409eb42bcb8216260460e58e990188d6555db458e0b90ac7773ede33e37f9d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://catamma.ru/uplcv?utm_term=modern+control+systems+13th+solution+pdf PDF link annotation
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/56625262953.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/juxalawuveka.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/93713463645.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/xidizoferebofone.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ebdba9f26---dilironovosidojas.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/jobawujupexofivegifit.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/luxijomizeguxi.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/84120994965.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/84417151290.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/66432251695.pdfIn PDF document text
    • https://unaizahic.com/Files/files/fugito.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/velekaxobowajosutanedosu.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/riwugokozuj.pdfIn PDF document text
    • https://506hlapeta.com/files/file/21884807603.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///jinodarug.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/dugajibukofesuve.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/6fe92385d5413bfd758638baf6938a76/muzukixulijotufu.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/venezoniv.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/gaverurexi.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/48943485513.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/zaludaf.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/78010953016.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_off0000e08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89F 16484 bytes
SHA-256: 80f43de78e315ff7d64a28e743a5e86685963a647503d004f724a121ccd12979
font_02_sfnt_off0001231c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231C 11152 bytes
SHA-256: 5cdf0f8dd4325f23ccb990972c5390c8d82f16cb4354d0817c6c3f2b698caafa

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