Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a9706b89cb200d…

MALICIOUS

PDF

71.1 KB Created: 2021-09-18 12:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0c3548c28b9c18893738f411d8511523 SHA-1: b178287dd2859aafb52c82c0d028cd8f8af79c0d SHA-256: 43a9706b89cb200df832b9c5aa843e60173b0ee524c03592d15f5302f4905b20
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm with numerous disposable hosting links, suggesting an attempt to obscure the ultimate destination. The presence of multiple unknown URLs indicates a broad distribution effort, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/6395b7a89f6afd793b0d75258a9f9b64/kositumoso.pdf In PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/29596611675.pdfIn PDF document text
    • http://technocom.pl/editor/file/64920415930.pdfIn PDF document text
    • http://epicridesnepal.com/files/nogimajokalowu.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/kesarotijidalitevini.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/pebilu.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/12464217304.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161350fd5a010d---jejevonovanov.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/gofuti.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/67680550451.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/derajekawurubi.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109061816399376.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/nofegerikojurovajuw.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/rixetaroxe.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/novuvubifekepotef.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/tozepuwupaxa.pdfIn PDF document text
    • http://techmechengineers.com/uploads/mejomana.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/32508163802.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/16375961915.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210908115112_sd4vd0.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/56293215514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=import+pdf+to+excel+freePDF 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_off0000b7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBA 15920 bytes
SHA-256: 7408908e36c0e9d49171420c0e19111fc4d40c52bdbe38b71fbf967b2262c21f
font_02_sfnt_off0000f845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF845 10308 bytes
SHA-256: 6e40cad3d0279f456712e46e020f7b8cf37c912a8539dff6f9cc575f2384e126

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