Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff51682fe0cf1ecb…

MALICIOUS

PDF

79.2 KB Created: 2021-09-20 22:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c9f1d7111110998386ea08734cac4d63 SHA-1: b1960c7508c710e1fe5835755aaa788f21c88ca5 SHA-256: ff51682fe0cf1ecb7258215336d4c6936b3c0c6a6eabe5685d39a47e9595e50b
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files. One URL, 'http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/mudinutisedifeviboleludop.pdf', is particularly suspicious and likely part of the malicious infrastructure.

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 http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/mudinutisedifeviboleludop.pdf In PDF document text
    • http://ailizia.com/userfiles/71536504777.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/63814564363.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/66974595792.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/62580597717.pdfIn PDF document text
    • http://proart.by/media/file/vixufonoguge.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/vexekijaj.pdfIn PDF document text
    • https://mfdesign.hu/files/file/kutixamab.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/xamukujaburufej.pdfIn PDF document text
    • http://ttc-investco.com/img/files/48080929659.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/70808147888.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/14639015158.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210905_A467188C097083C2.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/24407841740.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/54449216501.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/96860111974.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/807148295.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/8iq7a8dvk7s9vrrft4lmpvuj1q/82612297104.pdfIn PDF document text
    • http://safetruck.gr/images/file/22503816582.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301142323a0---51782384579.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/97978555535.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/87570505755.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/44049514072.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/86146566436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=meetu+pro+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_off0000d11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11F 10020 bytes
SHA-256: 94b1075ba66d93a881e9978817fb3ef4b542de03185abedb2f14886c8e0cb4cf
font_01_sfnt_off0000e786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE786 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF98 18312 bytes
SHA-256: 5d74c9f338f88662a915184abb1ce97989913fab28ae5d513be0cf197b0dabb7

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