Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd57de1fae405eb6…

MALICIOUS

PDF

84.6 KB Created: 2021-09-19 13:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 274d856bd5f350511a380867260ca733 SHA-1: 3c36b4574132755ca1556bec0ed108b416ca4cbd SHA-256: fd57de1fae405eb6506268c00214265af1d817b267d973553ebdb2153aa07e53
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to redirect users to potentially harmful sites.

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 https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/xewexadevixapamo.pdf In PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/fukifinuvemupuxu.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/jegezuxikawifupebigameruj.pdfIn PDF document text
    • https://egf.tw/test2/images/file/9838511037.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/31149333725.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/a241b05e9717b378cca6a48b988a4b1e/38511135319.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/11934502521.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/lavim.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///sopevesofumekilatunewoki.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/6022395892.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/81903518482.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/zaferor.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/gibom.pdfIn PDF document text
    • http://idroter.org/userfiles/files/94428331678.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/49177912485.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161452f9af2fbb---sufudetifipemogunodolo.pdfIn PDF document text
    • http://newcityhk.com/userfiles/dixapuxamose.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/63726421325.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/43340283998.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/89121981665.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/buzajomojuruwo.pdfIn PDF document text
    • http://balone.net/_upload/file///14868772116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=psychomotor+domain+verbs+listPDF 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_off0000e5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CA 10956 bytes
SHA-256: a7481c64682e2e1ebe062d5cdde5880dc276ac2da53979cb3e60cb9eaf50a52f
font_01_sfnt_off0000ff08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF08 17520 bytes
SHA-256: 197f205a5e6cc0f827f12b08175959761683dd4a76fba83e5c9a81bb3b0dcd4a
font_02_sfnt_off00012cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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