Malicious PDF — malware analysis report

Static analysis result for SHA-256 98180d58e1658f73…

MALICIOUS

PDF

62.6 KB Created: 2021-01-25 09:52:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: d1c694f3c636d74c50f5c370e9971464 SHA-1: 7914ed768da131cd2444da61d0c153efc66390c1 SHA-256: 98180d58e1658f7369a2d918545efaf92bbec48e923df20a67b3f529e5da6f18
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF document contains multiple embedded links that redirect to known malicious domains, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection also strongly suggest malicious intent. The document body is heavily obfuscated and appears to be a lure, likely attempting to trick users into clicking the malicious links for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/aws?utm_term=dnd+5e+dm+guide+anyflip In PDF document text
    • http://menformula.xyz/poxutudosogawiboxukopugimatg8i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489407/normal_5ffe727d140ee.pdfIn PDF document text
    • http://procripton.com/the_silent_age_chapter_8rw2b4.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxobilan/73icLlw/13310072634.pdfIn PDF document text
    • http://znalomstvavip.site/dusiwugofl1aj1.pdfIn PDF document text
    • https://cdn.sqhk.co/zumufapofow/fmiegcH/mitulopibanurebex.pdfIn PDF document text
    • https://cdn.sqhk.co/mirusopujame/iajcG5k/86890990477.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/Yxtjhib/corneal_cross_linking_surgery_cost.pdfIn PDF document text
    • http://idealica-official-it.website/17170430480ax33.pdfIn PDF document text
    • http://samyog.ru/weruzelixababevovuzebuqq1tv.pdfIn PDF document text
    • http://prolac.ru/merumexenokabopotetojigud9s92.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxosutuku/hghflKh/begejavokesizate.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/hceiexk/40457705536.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383566/normal_5fce12003cb72.pdfIn PDF document text
    • https://cdn.sqhk.co/luwivimexu/j5Nggz0/your_life_simulator_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472764/normal_5fe227af6cd52.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/laradusa/51115434632.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/gross_and_net_income_worksheet_5th_grade.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB914 5312 bytes
SHA-256: a0995783cde2ed370b7dc1421810f12f1575212fb541f2a19a03f3f3bd5e1e69
font_01_sfnt_off0000cb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB29 10056 bytes
SHA-256: cbd838f29c8d11a395f37e5a2fcc128d755d4e8d3cc59f8f1d668c3baab89fd4

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