Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f230700dcc8bd8f…

MALICIOUS

PDF

85.2 KB Created: 2021-04-02 07:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e326f444551509b82e15a1d168e68c02 SHA-1: da2c62981d7862e272dd0aecf70b6cbe985ef9d0 SHA-256: 0f230700dcc8bd8f134f43f96aa024c04b8cf8b59a4e82219a3acb27872ec207
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are part of a link farm designed to appear as search results for a manual. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/wix?keyword=tp+link+ac1200+re305+manual+en+espa%25C3%25B1ol
    • http://sefegusekepuxa.mypressonline.com/3689213988.pdf
    • https://cdn-cms.f-static.net/uploads/4390642/normal_601afde7aeef0.pdf
    • https://dudulisatosix.weebly.com/uploads/1/3/1/6/131637211/1558802.pdf
    • https://cdn-cms.f-static.net/uploads/4453142/normal_6022dd372a7a4.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • https://cdn-cms.f-static.net/uploads/4428039/normal_5fd67a73133ee.pdf
    • https://static.s123-cdn-static.com/uploads/4454281/normal_5ffbad538af69.pdf
    • http://cetop.xyz/zefuxijejumotekagozoli1kdp.pdf
    • https://cdn-cms.f-static.net/uploads/4376857/normal_601dba74c0a80.pdf
    • http://mesanezedid.mypressonline.com/mixolifiz.pdf
    • https://cdn-cms.f-static.net/uploads/4454436/normal_6029d39e4c267.pdf
    • https://cdn-cms.f-static.net/uploads/4449178/normal_5fd34f17bd6d7.pdf
    • https://cdn-cms.f-static.net/uploads/4405197/normal_5fd74ec41fcba.pdf
    • https://cdn-cms.f-static.net/uploads/4416939/normal_60421beda6428.pdf
    • https://lumabejisojexu.weebly.com/uploads/1/3/1/4/131455378/9562428.pdf
    • http://circleshtang.xyz/bcbs_appeal_form_arizonab3esu.pdf
    • http://vuwimoxit.mygamesonline.org/article_defini_indefini_partitif.pdf
    • http://9gusevshop.space/sorcerer_saving_throws69p5c.pdf
    • https://fetevosave.weebly.com/uploads/1/3/1/4/131438058/sidizipifukalagud.pdf
    • https://vizavidonase.weebly.com/uploads/1/3/4/0/134040461/wovoxakugaxule-vujib.pdf
    • http://riwotivadejud.sportsontheweb.net/73255167513.pdf
    • http://zvezdasevera.online/mecanica_vectorial_para_ingenieros_dinamica_hibbelerrg5ot.pdf
    • https://cdn-cms.f-static.net/uploads/4390097/normal_6051948133541.pdf
    • https://static.s123-cdn-static.com/uploads/4481400/normal_60069c30bafe1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b7a.bin
17d8413da1c105137bff33e29109d8172a8945f95913e068029ec0df127be60b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7A 5920 bytes
font_01_sfnt_off00011f4b.bin
211ff3c9c5fd860197c85e0ecc2bafad6bec0cf23570b4fdcc7f15d9ec277aa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4B 11348 bytes

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