Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f19562584d169ba…

MALICIOUS

PDF

77.1 KB Created: 2021-09-15 16:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6e10fe7911d57533fe71b6ea71929bfc SHA-1: 16f5380179182e3bc297bed7ecf557814486c5a9 SHA-256: 2f19562584d169ba1233a95a3595245b59dbe14a91a2d7129d4c1e21f1b418aa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and a high ML score strongly indicate malicious intent. While no scripts were directly extracted, the structure and heuristics point towards a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://studioindelicato.com/userfiles/files/xafejumuxojir.pdf In PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631693707nmHB.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/talix.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/74404677739.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/26549239674.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/nabakoxidilumitobiwaxidu.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/36129810374.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/zuvofinopob.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/49356144733.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/75269510271.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210914_C2C5552EBB5DF8B0.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/jinanabitiniwavifa.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/99072635663.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16130ef4860430---baxozerubomawizisirave.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/digeledepilefuvanumevase.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210907_103702.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210906162113_d602bt.pdfIn PDF document text
    • http://chinalabware.ru/d/files/dapugod.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/guvale.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/sodutopadumofiberejijuma.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/zivuxanobolu.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/50136153161.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/1113612226135e54cb708a.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=auto+scroll+apk+modPDF 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_off0000c889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC889 10520 bytes
SHA-256: 556aae1c52c74fa4e36f5ea3de30a0f3f2b2bf0cd19c68ae7eb693d0df2f1f0f
font_01_sfnt_off0000e0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A1 17680 bytes
SHA-256: 0bbd8df3816bdcbc3ee0805b6d590a98625e8e50d435ca5f95ca6295177677d6
font_02_sfnt_off00010edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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