Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d5acf89845ddf7…

MALICIOUS

PDF

75.3 KB Created: 2021-02-08 19:14:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 04276035e4b5b3a4252d890f81e5ec67 SHA-1: 918068b206859054825e52b25971bedc481c1e40 SHA-256: 18d5acf89845ddf70c6b376636114352812dd10e4d3f9a2226d7c3101ba5fb67
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/wb?keyword=ladybug%20and%20cat%20noir%20episode%20guide PDF link annotation
    • https://cdn.sqhk.co/zesonixiv/jbkOHs9/20654226986.pdfIn PDF document text
    • https://cdn.sqhk.co/fabavukunatu/ishhV4X/hawthorn_bank_jefferson_city_mo_careers.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/iehgieW/ludubifokasosobam.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/YjihUj1/knife_throwing_techniques_for_beginners.pdfIn PDF document text
    • https://fafidapumexeri.weebly.com/uploads/1/3/1/4/131437561/jogakuto_wexovugegan.pdfIn PDF document text
    • http://bofesota.66ghz.com/33398485152.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/DheheQT/90616279983.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403560/normal_60068d3be2a6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_6015715ec1673.pdfIn PDF document text
    • https://velonifiwivuli.weebly.com/uploads/1/3/0/7/130739758/1615249.pdfIn PDF document text
    • https://cdn.sqhk.co/naludibeg/Ege83jb/tubal_ligation_reversal_success_rate.pdfIn PDF document text
    • https://sisilodoja.weebly.com/uploads/1/3/1/4/131406442/mijakeguf_resupifigeweriw.pdfIn PDF document text
    • http://tiwirodizefa.iblogger.org/sajitusefogape.pdfIn PDF document text
    • https://cdn.sqhk.co/noxuluni/1hdUgfg/calculator_for_wear_os_android_wear.pdfIn PDF document text
    • http://sudejiw.22web.org/export_html_to_using_php.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fujesotes.epizy.com/xiwiwixavola.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_off0000d9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B8 3036 bytes
SHA-256: bddb27d6ef51051f540bc338174f00a272d1ede19a8907106748ba16c6c0f496
font_01_sfnt_off0000e497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE497 5392 bytes
SHA-256: 95d2fb86addf5d74fe838cb63858caf80ddfa286861afee77f1df4a55d7301b8
font_02_sfnt_off0000f706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF706 12428 bytes
SHA-256: 18b668016851feb5a2af36638975e32c728b4293db5d9c5a9871f60b681fd3f3

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