Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb90b5445ff6b199…

MALICIOUS

PDF

75.6 KB Created: 2021-04-08 05:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 1ad8b2b84833b04ce95b6470e1caf61d SHA-1: ebd52f7868629d75efa291b6728cca24aa186a06 SHA-256: eb90b5445ff6b19929c64d1b556701a757f7d0d6316b49193033b07d6b804774
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • 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://botokaw.ru/strik?utm_term=norton+anthology+of+western+music+7th+edition+volume+3 PDF link annotation
    • https://veguxalefimas.weebly.com/uploads/1/3/1/3/131382166/tikewepesusala.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366309/normal_606b42563c8af.pdfIn PDF document text
    • https://niraniki.weebly.com/uploads/1/3/4/6/134662237/vegozudow.pdfIn PDF document text
    • https://sinepakeje.weebly.com/uploads/1/3/4/4/134490574/gibuk-joremaruri-bitatijimevowev-komaxamapabe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372983/normal_605a4a6284898.pdfIn PDF document text
    • https://gubilipolijig.weebly.com/uploads/1/3/4/7/134707964/sisuteg_jimirave.pdfIn PDF document text
    • http://begdas.space/how_to_start_ms_project_2013_for_free2y3le.pdfIn PDF document text
    • http://mixonajoko.iblogger.org/pamixufedaf.pdfIn PDF document text
    • http://help-copyrightservice.xyz/126088301353m1l2.pdfIn PDF document text
    • http://100naturals.fun/pokisaxevivekade5huxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_fc1b8a58301141ae97a9489dab75e977.pdf?index=trueIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_d09ebce7089c4a909fbc35fa029eb7d4.pdf?index=trueIn PDF document text
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_8e916d637078461cb52cda5cc5c1132f.pdf?index=trueIn PDF document text
    • https://f538c46d-6aff-4997-95da-320e40b30403.filesusr.com/ugd/262ba4_c4962f08821f40f4b6890e946eff6fba.pdf?index=trueIn PDF document text
    • https://dd67658a-cc17-4e1c-bca5-42bf299a485b.filesusr.com/ugd/07a440_ee5fc877b21b46218e5286d017750891.pdf?index=trueIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_dc2921eaecfb4cbebef5ab1fd613e61a.pdf?index=trueIn PDF document text
    • http://vewetumizobu.rf.gd/tepakabebu.pdfIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_08af9ac90ee743149d9b1b8d1c72f2ba.pdf?index=trueIn 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_off0000e45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45D 5900 bytes
SHA-256: 653aa4acf60bfd60dd88a3a5f89d01098805b1e3080171426bbc674fd51ec544
font_01_sfnt_off0000f87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87E 12552 bytes
SHA-256: f11efb6fc16fcb14570685e8dcdf0b32e482b7f9f02bdfdd5662175c2de895a7

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