Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc8bdc520614e0c…

MALICIOUS

PDF

76.1 KB Created: 2021-09-19 11:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 855b1ea92ff7c9a321eb9647fa36c28b SHA-1: 08408345be336629a4d2a1617c6f53ececb21351 SHA-256: bbc8bdc520614e0c1a2eeeba12b724dc4036cb44a2d33d544ae220b8b8bf839c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a password-protected archive lure, suggesting it's designed to trick users into downloading a payload. The embedded URLs, while many are benign or unknown, point towards a link farm strategy, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/vunesenubejugam.pdf In PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/68823905839.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/50166282671.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/22616157971.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/46368929331.pdfIn PDF document text
    • http://ud2-140.com/files/kadol.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/96665657662.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613729b47a728---50022026913.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366d14495b8---gomoxes.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/48100318900.pdfIn PDF document text
    • http://esejsc.com/upload/files/47958400604.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/wamofolanawukedap.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/gipezawazaruzununope.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/sosabifef.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/65858270381.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/sawixo.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/35395162995.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/dotesejoman.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/83271154206.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/91893689563.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/28674058307.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210906233000.pdfIn PDF document text
    • http://dentherapia.hu/files/file/ruvosezovusitemo.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/86761293728.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/97985270843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=spiderman+ps4+download+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_off0000c2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0F 18380 bytes
SHA-256: 453329fe1dd95ff126b902fb596dcd6a92ca9b9339e99b5a47a2579719da3e53
font_02_sfnt_off00010a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6A 10784 bytes
SHA-256: 9456eae8e5f76751e13ae8230025df4eae0eb0946d86a411b5a9340bbfa42f4c