Malicious PDF — malware analysis report

Static analysis result for SHA-256 793c50fa8afdfb6e…

MALICIOUS

PDF

86.6 KB Created: 2021-09-18 17:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3f1761605fdad98a8a8e853dbf13cb2d SHA-1: 295b25004a170c591bf9f75f36848aa61340fbe1 SHA-256: 793c50fa8afdfb6ece88481cca730394e19dc374d7672262f74b771ea71d7928
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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://garglob.ru/uplcv?utm_term=synopsis+of+handmaid%27s+tale+season+1 PDF link annotation
    • http://ajtoablakcentrum.com/_user/file/lugixarawatimijaxorafi.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/mufetagonebomupeful.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/sokuni.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/wakerumelifirude.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/putirig.pdfIn PDF document text
    • http://mebco.ru/images/file/fazewetaxeja.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/30716417714.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210913_ABD9D9DE567908B7.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/16710077652.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144c842c558b---viwaxozizibapov.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/pobaxadufa.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/51240346973.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210910162932196.pdfIn PDF document text
    • http://livilgirls.com/files/nedutenamatukemul.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/petosegomigowu.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/zabemuvutejiwol.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090222162998.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/geteratakiforiv.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/vuzizaruso.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/balimagozefovurezirofiwa.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109172215136672.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/23350555363.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_off0000ee89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE89 17240 bytes
SHA-256: a4a63d26bf81701b29e5d760651499dfa3ff55e5bc572df51172062828169fb9
font_01_sfnt_off00011b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B43 10936 bytes
SHA-256: f2d39eed4bb7535ae9cb2263372ad75ccca7921fe62056d45762f3421feb6a8a
font_02_sfnt_off0001348d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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