Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1c1ac19883171b…

MALICIOUS

PDF

70.0 KB Created: 2021-09-23 21:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 244787478a407655a281d0a21b86e22f SHA-1: 5628affe380ee2b4155ec2901462f00ace8e2d43 SHA-256: 8d1c1ac19883171bffab4f9e21f9adc1b7ab2d3bbbb06edff618d236fc4c6f8f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, potentially exploiting them via drive-by downloads or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://chokysitohang.com/Uploads/userfiles/files/pururafozudubenizi.pdf In PDF document text
    • https://clubon.top/uploads/files/romifubotarovis.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/xozafud.pdfIn PDF document text
    • http://tabletopad.com/images/file/75248801389.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/1032349913.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/xorataserosibudimawa.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/rowisewejanivoruwavaw.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/numer.pdfIn PDF document text
    • https://chanty.dacola.com/upload/files/pexataroronegorep.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/nigaxixeroraxolaka.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/89363000642.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/recir3pdi7cr0p6e63kq6lhctv/26221099847.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/36099267365.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/60157354661.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/jileteluxoxegoruwu.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/xuzisamumagupoken.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/94577962201.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391b99a85d2---bonulavav.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/69037764884.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/tazapirobujer.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/xowutozosina.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/jasojemapadudogura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=apk+of+free+fire+unlimited+diamondPDF 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_off0000b1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E3 15848 bytes
SHA-256: 304ee81dda7a14fc11227266eed8498ddaa8afe83c6da66b4497991cbd92078d
font_01_sfnt_off0000da33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA33 10664 bytes
SHA-256: 6f301040ac6b3016a3511b5c77a66fb154657d80e852551ddb5366fe6e67cc79
font_02_sfnt_off0000f29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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