Malicious PDF — malware analysis report

Static analysis result for SHA-256 8018ba2029f3ec55…

MALICIOUS

PDF

73.1 KB Created: 2021-09-19 15:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1ec02ebe8a9ef3a2964ae59a3e899365 SHA-1: 1aa9a4010cd4349d8e8d13290ebe3742918a547d SHA-256: 8018ba2029f3ec551a403cd46d9604fe2d72707c531939710e130e8662aef78a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cmf8.ir/data/file/nimidutij.pdf In PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/68750561074.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/tamurosobesut.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/negedizadutidenokos.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/78979875370.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/36663634002.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/gusakotuputavulexeset.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/51917879466.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145f0990127f---16738424511.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/pazawajidudakufovanisasu.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/kuwakagabebikazes.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/68875222099.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/95465402453.pdfIn PDF document text
    • https://masihpt2.com/contents/files/ruxawakotojodudowaronujib.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/nuviwi.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/37699175269.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/lidam.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/88527719905.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021091300033373499.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/tudekegep.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/gojuzerepuj.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/ac6f088430725d15afef589fc8bfd6cc.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/98047550072.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/85699870470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=samsung+galaxy+s3+price+in+bangladeshPDF 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_off0000b83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB83B 16960 bytes
SHA-256: 4c7c961ac4c8d78c24c45df76cea2545cc926b5d8e6523afa6abdf351e083bea
font_01_sfnt_off0000e407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE407 11444 bytes
SHA-256: 1426388aaeae7d6986807579b24c8e46e3caf2858c57736288a9a566e2a9b2cc
font_02_sfnt_off0000fe6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1