Malicious PDF — malware analysis report

Static analysis result for SHA-256 000efcf1b3f704e6…

MALICIOUS

PDF

75.5 KB Created: 2021-09-09 20:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a9d7a724aab84f9079e0ce76d9028b69 SHA-1: b4e8f834db9ab3c8c9afbcdfbcb13e26a7974c8a SHA-256: 000efcf1b3f704e6ef40004d5a7c559e6dc7623d7580bb37b213e71d653cfad4
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to potentially malicious domains, suggesting a link farm designed to redirect users to harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a deliberate attempt to obscure the final destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 5

  • 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.
  • 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://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/dc910d8141322508bb1d2b5a03fd51b4/zezaje.pdf In PDF document text
    • https://smg.bid/ckfinder_userfiles/files/togazab.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/nidazebuxabenunetuwivewop.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kibujojomatigikixalemikod.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/bimujolifuxige.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/83644038780.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f968a77a02---30729807341.pdfIn PDF document text
    • https://alariel.be/userfiles/file/mifewifovipipepofofodin.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/46419709926.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/midevekulesutawunedexew.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/mubapufibabogarofopobijo.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/jugizuludoraxagopido.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/5220839081.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/ririgenuzedodajuvux.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/velitofinetijetapol.pdfIn PDF document text
    • https://attack.lt/images/files/mixawulagurexopefixose.pdfIn PDF document text
    • http://4rrecycle.com/files/file/bexuzuzipedixeges.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/70042788810.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/63654942284.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/nudomulewebisesemosu.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/fonaboteninode.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/wexufozij.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/jijixogovobewikoji.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/zegazovepawiweduwewidisa.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/88399992006.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/16882439783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=screen+sharing+android+to+lg+tvPDF 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_off0000c392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA9 10788 bytes
SHA-256: 05696d6adf141eee23d0b5e81b16b6854743f0ba744a2d56afe9d646870c49e3
font_02_sfnt_off0000f43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43A 17016 bytes
SHA-256: 39880d87861a61cafa0c22820897c200cfb07aad877886ae16a31a460d67f410