Malicious PDF — malware analysis report

Static analysis result for SHA-256 522b4e2847805470…

MALICIOUS

PDF

78.7 KB Created: 2021-01-26 11:18:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c0c965f71897fb6fedef4da6ae8cd4b4 SHA-1: 5dfe464fc33feeb1f5923672b23265a68b698ba0 SHA-256: 522b4e2847805470acd83a8327b3fa6be712a55600f6620126ba3047be9ac316
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document is flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, one of which is identified as a disposable hosting link farm. The document's content, disguised as a style guide, is likely a lure to encourage users to click these links, potentially leading to phishing or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/aws?utm_term=engagement+ring+band+style+guide PDF link annotation
    • https://cdn.sqhk.co/kufedefivuvu/VhfwAjh/pacioos_sea_level_rise.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370987/normal_5fd12efbe59f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455902/normal_5fecce07e955d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422627/normal_5fca0e752ed9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460447/normal_6002af178d893.pdfIn PDF document text
    • http://bonusiotsbera.online/nivomaveretunavigomojyq3y8.pdfIn PDF document text
    • https://cdn.sqhk.co/sigagegijej/agjhijb/defender_marine_hours.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bowupezik.epizy.com/86430445408.pdfIn PDF document text
    • http://nepogewapiw.epizy.com/49027291019.pdfIn PDF document text
    • http://kimitumepogamom.epizy.com/68786629979.pdfIn PDF document text
    • http://nupuzasig.epizy.com/tugenewamawefotinobo.pdfIn PDF document text
    • http://gefaraw.rf.gd/21571972491.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99F 5116 bytes
SHA-256: 06eb339128c27f091058f4cd83c1679f4736c7125478a16d7a7bfe72d99e339d
font_01_sfnt_off0000fae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE5 10892 bytes
SHA-256: a43f832dea53d8c3f493fd93426dd834fbab36da221714d3879109d16917b95c
font_02_sfnt_off0001201a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201A 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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