Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5746bb8b2f19564…

MALICIOUS

PDF

71.6 KB Created: 2021-10-02 20:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3f556d1244bb5339018ee3f7c137e481 SHA-1: c460bc146f4aad121ddef93a228a565860c58646 SHA-256: c5746bb8b2f195649bc163fc3fbfbc29bc76e533847011d5abe13d8719e9e796
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct, potentially malicious domains. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://euro-ex.net/images/blog/file/71290268080.pdf In PDF document text
    • http://ymjgolf.com/file_media/file_image/file/jusukokode.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/87706011840.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210912010855697.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/603673049.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/wixuk.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/16917337942.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/gulaberimabif.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/42360128102.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/44922280151.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/81181270378.pdfIn PDF document text
    • https://fuoriscena.eu/file/1430525783.pdfIn PDF document text
    • http://yansyuan.com/UserFiles/images/files/52866066509.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/40297592519.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/47900321322.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614a09908ee88---17561465512.pdfIn PDF document text
    • http://brlairport.com/images/file/zirufugakuw.pdfIn PDF document text
    • http://envigest.cz/upload/file/befezodijodarepes.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/redijonupesalolavaneg.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/dejesan.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/wilojidanisalajijuta.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/fubinagiweritavigizej.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/22972974731.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/34187290218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+convert+a+pdf+to+a+svgPDF 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_off0000b4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EE 10800 bytes
SHA-256: 0582b3b249920247b0506a5583b872d21d5d79291fd700bdd985efec45db9396
font_01_sfnt_off0000cdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC5 16896 bytes
SHA-256: 3fabbd9db64f1c5a6f192408c355746f27191b249082dc9333caff8278734570
font_02_sfnt_off0000f8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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