Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff12473eb778c0e…

MALICIOUS

PDF

75.8 KB Created: 2021-09-20 02:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 203e233d319c3549e37a76acfd510f5b SHA-1: 3398c87049344f57f441c78034da5638766f8918 SHA-256: bff12473eb778c0eca70f4d2aee47b10f8dfbf2441223ae8d586300c519967fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs and its classification as a link farm on disposable hosting strongly suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://smidgel.ru/uplcv?utm_term=android+icon+circle+with+line+through+it PDF link annotation
    • http://aotwresort.net/ckfinder/userfiles/files/pimemalemaxerunifabu.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/68910045839.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a3af472a3---nifudotinafone.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/zoruxaxonilowifofa.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/gumodusodudo.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/27741855467.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/26415727427.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/68327249126.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/15918314814.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210914091518.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/purasivukupesadugovitoso.pdfIn PDF document text
    • https://umartravel.com/files/tozozedurirutug.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/mazigezulelekaxuxu.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/punaxelafavelimefasalija.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021922154256956.pdfIn PDF document text
    • http://slsnn.ru/content/file/32527761669.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/tutibajulodezagigidisamu.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/94881098030.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7b5b5785b---vebanapijavonuxufumo.pdfIn PDF document text
    • http://szwygs.com/upload/59376655452.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/94975754505.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/jidanagapikigagisux.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/38972241118.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_off0000be36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE36 19700 bytes
SHA-256: 464a1a31b3e869bf672b804a20e23ca86b9dc1691ab1f8b44e5598973ec13807
font_01_sfnt_off0000f1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E8 10488 bytes
SHA-256: ba73a8eb7084a92aca84156848d41b4a73cb151d2ec8acc22dcac5c53eaf778a
font_02_sfnt_off00010980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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