Malicious PDF — malware analysis report

Static analysis result for SHA-256 affb2e9716a784fd…

MALICIOUS

PDF

72.1 KB Created: 2021-09-17 09:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d6cadd020535bb8deb2e16b84d052128 SHA-1: 684e9cd8735118cf7578d73e99b7333d3ff3db3c SHA-256: affb2e9716a784fd0208be504a5b81ff8b43d9cd5dc485caa4d5ef7e188ad8e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a link farm, pointing to a phishing or malware distribution scheme. While the document body is heavily obfuscated, the presence of numerous embedded URLs, many pointing to PDF files on various domains, supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://oikoscoccatoarchitettura.com/userfiles/files/58351407594.pdf In PDF document text
    • http://orvosvalaszto.hu/uploads/files/78912988349.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/31879432707.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/14577875286.pdfIn PDF document text
    • http://canvangdientu.com/images/file/16204017781.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/89248251718.pdfIn PDF document text
    • http://etnorom.hu/pictures/mipumedutukovumevinikesoj.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/59521860812.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/wososunimeka.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/2990387515.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/58240911119.pdfIn PDF document text
    • http://amirmazandaranihospital.com/ckeditor/files/files/4420680031.pdfIn PDF document text
    • http://grandfiltr.com/files/file/wodorasumijerasen.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/somakuzokutotezixe.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • https://menu2uplus.com/images/file/rirejizerikukut.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/10144884633.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163133643340.pdfIn PDF document text
    • https://kimcert.org/E/file/zugodizosorokowexosisedox.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/10293822979.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372198dd3cb---51881594167.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/5237582990.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/e57cb9cdc06bee9b7a22520f720f759f/beloxaw.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/tukemuniwofeme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=topkanale+ott+apkPDF 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_off0000b7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DE 9940 bytes
SHA-256: 5a41fd5f81f1474c5d21aa74f38b15af6fcd905b425807143e400e4ee45eeb35
font_01_sfnt_off0000ce01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE613 17704 bytes
SHA-256: 1b4c87847583904ba0fef0cc70dee12041c7b792c26e064ddcd0da6ff0089e0f