Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfa76ea0e7e410c…

MALICIOUS

PDF

84.5 KB Created: 2021-09-06 10:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d23756f90f832bb4cf42738edfd4aabd SHA-1: 5add0bb2bcaaa0a91bf8a746674ae5cd20cca733 SHA-256: 4cfa76ea0e7e410c1d9f50986b9b9ac8ea8c132ef246a2b500cfbe6b0cb7b898
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external URIs, including a link farm on disposable hosting, suggesting an attempt to redirect users to malicious websites. The ML classifier's high confidence score and ClamAV detection further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://synerhu.ru/uplcv?utm_term=project+report+on+automobile+spare+parts+pdf PDF link annotation
    • http://kxnjl.com/userfiles/files/62491436465.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202106261327162211.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/pigekuxerenitafomodo.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/nigidawob.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/motekejibegesaralobode.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613104bae18bb---66781615436.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/zadesopifa.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210823_48A1CF0081B931EC.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/60262301756.pdfIn PDF document text
    • http://onlinevay.com/upload/files/suteru.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e29f5a122---sosujufu.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/taxilepuso.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/93245435947.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/zinijokunu.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/92143251372.pdfIn PDF document text
    • http://www.toptehnik.si/images/vepuvutavovitejig.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021073033340_370162068.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/fopileji.pdfIn PDF document text
    • https://morabia.fi/images/file/penatodijozef.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/xusixolevubasirifolexi.pdfIn PDF document text
    • 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_off0000e1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F6 18556 bytes
SHA-256: b9d1bce61f9e0acb4b668984b4c4d506abf1e3dc781db3ea2f06456fab96e43b
font_02_sfnt_off00012a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8B 11152 bytes
SHA-256: a5389e2a2c0abff068c1f97526965acb9e4305f12dcfdddb0ad8b0ece80e5f9c

Open this report in the interactive analyzer, or submit your own file for analysis.