Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c55e42564145532…

MALICIOUS

PDF

85.9 KB Created: 2021-09-09 17:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 21de8f6f3fc03f2f6ae7f4e3050e5c3a SHA-1: 4ce85afb18600eddc496e60967d75381a2b5ee95 SHA-256: 1c55e4256414553281c2ead01f6953031ef760ca301bb25f05cd2a5a297fb8b2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and are likely part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or trojan delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that often leverage JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://homestayhoian.vn/uploads/image/files/nixeruza.pdf In PDF document text
    • http://kanizsakran.hu/userfiles/file/84040787790.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/96737548692.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/gebimefadizivafe.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210906004613978.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/62712074969.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/gabejedogadu.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/67756747163.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210901084624.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/jinoxi.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16137ee0175db9---nebiwetizaluvesiliwegone.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210908032954.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/75667308054.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/zunawevo.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/62325960454.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/fitemosijus.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/sukuvon.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/51432599525.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/87896866471.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/femuzevejuvidix.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/78014844190.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/mosigagiroladix.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/tanidirezatufivazadusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=play+store+app+download+for+windows+10+laptopPDF 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_off0000eab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C7 17656 bytes
SHA-256: 2d5b651e567af3cccb42e4de996d3990445c4006aa8e82474e1f168592f2527f
font_02_sfnt_off0001304b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304B 10864 bytes
SHA-256: 3798e9a9dc4fd685cdcec7949907bf7efe0249e830010364b3dcc75e28cd2dd8

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