Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef4d102ba71cdc8…

MALICIOUS

PDF

82.9 KB Created: 2021-09-23 00:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0b30d3920a3835025a3f44f0de618485 SHA-1: 0bddbcdb2768d25d8ee351adde0f638ce0fe107e SHA-256: fef4d102ba71cdc87c139976fd415a3602c34a3d0aa9fd843a20d1e79463ca05
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links, many of which point to other PDF files, suggesting a link farm or downloader pattern. The presence of a 'download button' heuristic further supports the lure-based attack vector. While no scripts were extracted, the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://soechi.net/userfiles/file/revow.pdf In PDF document text
    • http://17njl.com/userfiles/files/89375487721.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377ed0ba17d---58541708449.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/bonopa.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210908091618.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/fozobepukofesa.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/poxizudasapiteke.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/1216982970.pdfIn PDF document text
    • http://brlairport.com/images/file/lavusobinuzajireg.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/wamumav.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/luwagerodeno.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/natezurowe.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/95147827915.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/sisasenunafezerojijexem.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/28733179299.pdfIn PDF document text
    • http://royalgroup.at/tmp/84055082229.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/sesovu.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/9232830976.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/53355000833.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/69765293154.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/9211480269.pdfIn PDF document text
    • https://educhina.mn/editor/files/88836181991.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/1006154954.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/59695205917.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614032c1066c2---33738092881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=watch+online+movie+download+apkPDF 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_off0000dea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA5 10748 bytes
SHA-256: 7bc688deaec174244f2b949f861856c0ed069dd46a53ad7c0a20c1332474035d
font_01_sfnt_off0000f736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F48 17856 bytes
SHA-256: 94e2b834f2eb5585de9cce6b2501ba7157b841303a12180f25d6ad4d24b3e1bc