Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0723b5333475ce7…

MALICIOUS

PDF

85.6 KB Created: 2021-01-26 11:56:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 472dd35379c5a28194e9b0f8154885cf SHA-1: 7777b874457023b0125bbace57beb34d863e8b3e SHA-256: c0723b5333475ce70469439bf7ef5a7e8dc76353d4d05977c129631d923a4f1d
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to suspicious domains, with one heuristic specifically identifying a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to phishing or malware-hosting sites, likely as a spearphishing attachment.

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/wb?keyword=snow%20bros%203%20game%202%20player In PDF document text
    • http://activa-fb.com/1755344847f6xrq.pdfIn PDF document text
    • http://shopsupergood.site/julax48uq2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480162/normal_5fd7810f4e1c4.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/SegcJVP/daily_class_schedule_template.pdfIn PDF document text
    • http://winoraama.site/pinball_wizard_alliumbzpoi.pdfIn PDF document text
    • http://iuts.space/lexofedetawofipi1yhye.pdfIn PDF document text
    • http://mavitrade.com/jarobekadavotd7.pdfIn PDF document text
    • http://merishwheelrecords.com/lifetime_basketball_hoop_base_onlyi8qct.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390374/normal_5fd9f5b506119.pdfIn PDF document text
    • http://hookup682.site/695773193723vmyg.pdfIn PDF document text
    • https://cdn.sqhk.co/zeterabaxax/5tDgcog/makelukazon.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/KJif3id/18873701218.pdfIn PDF document text
    • http://robertferrell.net/19948941023dig5n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374957/normal_5ff8b275aabab.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/tudawufed/xetaxujefakig.pdfIn PDF document text
    • http://kevusej.epizy.com/atal_pension_yojana_tamil.pdfIn PDF document text
    • http://wajodojizofe.epizy.com/balsa_wood_sheets_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/54517455466.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_off00010f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F30 5872 bytes
SHA-256: ff399e67ce86928fa4b3e02b22438874d21f5655132b1f12395f04a87c77b9ac
font_01_sfnt_off0001232e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232E 11436 bytes
SHA-256: aaf06e5aa72cf90177ac5f4193c80304ef11dd5ec53a1083ee9b3139a78b9dc4

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