Malicious PDF — malware analysis report

Static analysis result for SHA-256 4480c3884b103c13…

MALICIOUS

PDF

74.4 KB Created: 2021-09-09 08:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a8888a88ae54c0a61cc4a4d28a9cf116 SHA-1: 19fabde17dd9f67c352bf08a10db0d6e10fb7d42 SHA-256: 4480c3884b103c13619e196ba3e5af10b17374c1b50e812a0aab237e052b0ac2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

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 http://edukoc.net/userData/ebizro_board/file/8108485258.pdf In PDF document text
    • http://paillasse.hu/userfiles/file/58444743829.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/10417549.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/59390319912.pdfIn PDF document text
    • http://reopen911.info/media/file/xerukawuk.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/48831707223.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/makiruvewuku.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/86104966759.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/4587557921.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa70135438---jimewe.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/6445865836.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202199743374754.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/sasodesumapigikasume.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/51033361092.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210902_1620F0D77DB19917.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/gefubafakejanebuwenuw.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/49385601696.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/wisowu.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/84527552969.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/puremuxobesox.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/bimokodikedebaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=funniest+love+quotesPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/faxebekukedumeri.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_off0000c130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC130 10128 bytes
SHA-256: 5a032310ac089f7c0295e1c9faddc54446e0801da33e7a109767104e6fadbb49
font_01_sfnt_off0000d7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F3 17124 bytes
SHA-256: f5d5d20104db3e17baae5e505f9ab67d0cb1102005de318ef7f230125ac75ded
font_02_sfnt_off0001040c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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