Malicious PDF — malware analysis report

Static analysis result for SHA-256 15db69b9addd3a8b…

MALICIOUS

PDF

98.8 KB Created: 2021-09-12 15:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cd6f0754b2e684b1db493cbbbedee828 SHA-1: e96f7d2f943246c2bd779dddb98661268e577e1d SHA-256: 15db69b9addd3a8bb2573fd39dbe8fca3d7517bc91aef9ff99afd24521cc1eae
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, indicating a phishing or redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is the primary function.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c3732fc1---kezefipinugunami.pdf In PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/06jr9f866ec19qtlrru16fk83m/deserovakijitekava.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/depivuzerorisafilip.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/tumubobokorupikuwadovepi.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/58519418218.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/julinekupimob.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/fipirugemenibotido.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/40811566391.pdfIn PDF document text
    • https://techlan.pl/files/file/jagikuzagifesezekal.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109042043196860.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/sinuvul.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/61687755901.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/25864200864.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/fuzafatotemub.pdfIn PDF document text
    • https://rinducm1.com/contents/files/47122404376.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/zarexawagizopamiwawulobi.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-4/20210904091256581642.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/59315663563.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/manakegegekomajagu.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/bexifalebuvaxixen.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/kiguvuwemowira.pdfIn PDF document text
    • http://dakov.hu/_user/file/linakererevujorusex.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/gesilitivafelizukimupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=what+parallel+is+the+equatorPDF 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_off000115fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E10 21036 bytes
SHA-256: eef0bcc5a8bd56ccda9c1b875aa1e87aff583e6deb0e189d2ec2a918aa7b277c
font_02_sfnt_off000165b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165B9 10484 bytes
SHA-256: 6034172da8d859191ddc9bd2bd9aa9615286e49de1a68f94066ea89ce4450af7

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