Malicious PDF — malware analysis report

Static analysis result for SHA-256 edcb498781c5156c…

MALICIOUS

PDF

74.7 KB Created: 2021-03-02 09:32:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: fabd27f9b4549dc85ae9afcddf8631cb SHA-1: 1e53c9028f338024e27d0a928ae5b4607e96c045 SHA-256: edcb498781c5156c6366271d250af84ace424d43b6f7cb5d63a24906abce72d3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body's reference to a 'synonyms and antonyms worksheet' serves as a lure to disguise the malicious nature of the embedded links.

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
  • 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://dugedepap.ru/strik?utm_term=synonyms+and+antonyms+worksheet+for+grade+5 PDF link annotation
    • http://podjem2.club/nabuzajogunazi73mu2.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/silvia_federici_wages_for_housework.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/84878338953.pdfIn PDF document text
    • http://xubanapirobula.mypressonline.com/88243151545.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417656/normal_60252581bf448.pdfIn PDF document text
    • http://quickpapp.online/gusimuletibanewjzak.pdfIn PDF document text
    • http://nupesupo.mypressonline.com/64026125302.pdfIn PDF document text
    • http://study-english-05.site/xewuzorii3bcf.pdfIn PDF document text
    • http://tiktokhd.design/kogisuwuzixetubejzi4cq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448984/normal_6036a0cdf1a1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450045/normal_5fdadbb011a47.pdfIn PDF document text
    • http://bixaxivajujojar.mypressonline.com/how_to_program_dsc_keypad_zone.pdfIn PDF document text
    • http://ridaxaki.mywebcommunity.org/42615691283.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424632/normal_5fe194f655c2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377704/normal_600a5ddc8b814.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380229/normal_603dcc5207b5b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://menenig.rf.gd/35069761816.pdfIn PDF document text
    • http://momubitirukoj.rf.gd/lesizomupofusirum.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_off0000e3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C9 5776 bytes
SHA-256: 30c1196eddea33afc21cf6fd5ddcce47004b4eda0397b2133e9307e2386d56a4
font_01_sfnt_off0000f766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF766 11384 bytes
SHA-256: 85e532290dc8bae5a487be277aaae33e9cabb65cf58172dc580c02af2f5aea99

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