Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a17f4e81f44e531…

MALICIOUS

PDF

97.7 KB Created: 2021-09-14 11:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fca0ad652791bbcb8469755b9bd2f8fb SHA-1: 4fb01e9085606cce140afeeedb35afb64b349291 SHA-256: 5a17f4e81f44e531a1d87d7ae47a1d6564da0988d1cbae1a37ad01440ed96da3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://philabc.ru/uplcv?utm_term=top+10+smartphone+brand+in+bangladesh+2020 PDF link annotation
    • https://wic-net.com/userfiles/file/9578074197.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109091644367109.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/82308995028.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/77369546367.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/denuxe.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/lagudedovetiweja.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e05ee0935---puduxajo.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/memozemov.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210907_180137.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/sedofilebe.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/pulijimerasafazob.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/tixudililojevarabugisa.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/kasade.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/zebidifejemozosu.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/pimimexumebedosawediti.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/zamijerineziv.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/voworifikefasudosipadebed.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/27236807274.pdfIn PDF document text
    • https://mahae.hu/files/files/jukadilovul.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388bed64d21---tafumavewuzukenaba.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/zigidel.pdfIn PDF document text
    • http://leton.pl/userfiles/file/40903788574.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/zowumomagumaxorev.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/lokeragik.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/legoji.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_off000115b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC9 18788 bytes
SHA-256: f8735f4bdcad7af0d016a41b44e91fe49dc4c77f706bd8889f6e2a60f5f49a17
font_02_sfnt_off00015edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EDF 11236 bytes
SHA-256: 26f9b92bf0d23648304ed40b8751d140884557205fd37115d6fbb7723dd126ee