Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c451c25a4333e4…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 03:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 695fb619dc4242f2e68a90395e6c77a0 SHA-1: 0b97b1874c8de2d92babfbe91caa739563211af1 SHA-256: 59c451c25a4333e471b450533c1278a1cbf048e73f07992fdbf14b7440452d14
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme using numerous disposable domains. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://adasbruiloften.nl/userfiles/file/36623742441.pdf In PDF document text
    • https://securitydm.eu/slicice/file/vijogudojegox.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/63908502314.pdfIn PDF document text
    • https://computerzone.pk/file/97914933431.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/nonubawunuxexiwun.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/lanulibukavuramozo.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/43877253898.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090512465673499.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091021162663.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/kadumiparafipenisep.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/82765477570.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/873550446613399dc38112.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/476236782a8326bcafe00ec7759456e0.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/wofifide.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/38658964865.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dilavidozulij.pdfIn PDF document text
    • https://kiptep.ru/file/bodedapegi.pdfIn PDF document text
    • https://la-klamm.org/Files/files/falokupik.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/poparitufikutumaridek.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/ginadovetiset.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/nafajomegutojurozupu.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/dabixavobakuzum.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/zelevamimofida.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/kogudoxorexof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=widgets+android+goPDF 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_off0000df00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF00 19360 bytes
SHA-256: e7616694de3e9741b7f85a653da5cfd90d49b799933cf7f04c10336ee972cc03
font_01_sfnt_off00011050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11050 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12867 10368 bytes
SHA-256: 26b6308aa8ce7899e3e201ca0c7a30558a52e78d035e1984dc9d2b00151c3fab

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