Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eda40bbfba211f2…

MALICIOUS

PDF

78.9 KB Created: 2021-03-15 01:21:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 19afcd311c498e9d16559aeab35ef6c3 SHA-1: 4b05300350166ea971bd4568432e49ca9787d4f6 SHA-256: 9eda40bbfba211f236aff7132daabc1c848865b5efa8b1e5a4deb619284b2832
186 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, and contains a large number of external links, many hosted on disposable domains. The PDF_SEO_LINK_FARM heuristic indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to distribute malicious content. While no scripts were explicitly extracted, the nature of the link farm suggests it could be used to redirect users to phishing sites or download further malware, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://zajinet.ru/wix?keyword=que+es+sustantivo+propio+ejemplos PDF link annotation
    • https://pepotojil.weebly.com/uploads/1/3/4/9/134900045/d4a85cf091d9ea.pdfIn PDF document text
    • https://dovedesomubax.weebly.com/uploads/1/3/4/4/134487211/zimoxukote-wugikidelog-fesofedoze-welipev.pdfIn PDF document text
    • https://zopokobo.weebly.com/uploads/1/3/1/3/131383813/feminagisolumab.pdfIn PDF document text
    • https://kizinuraximi.weebly.com/uploads/1/3/4/4/134446503/sejipadaraku_vebujufawo.pdfIn PDF document text
    • http://lixodamevurobar.mygamesonline.org/geferevujixaxexixogonim.pdfIn PDF document text
    • http://nezowigivomi.scienceontheweb.net/89801888731.pdfIn PDF document text
    • https://wowobomufib.weebly.com/uploads/1/3/0/8/130874304/kogasegawikoleso.pdfIn PDF document text
    • https://sajolunuweto.weebly.com/uploads/1/3/1/4/131407571/jagokase.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478127/normal_5ff28b4932f82.pdfIn PDF document text
    • https://zavisedifigi.weebly.com/uploads/1/3/4/3/134316550/vemobunevelixa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369909/normal_600b6d064daf9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371807/normal_5fee76423feb7.pdfIn PDF document text
    • http://vofufime.mypressonline.com/a_therapist_s_guide_to_brief_cognitive_behavioral_therapy.pdfIn PDF document text
    • https://vuvuzuvikedatun.weebly.com/uploads/1/3/4/5/134529562/pibida.pdfIn PDF document text
    • https://dadojunolibete.weebly.com/uploads/1/3/2/6/132683289/1280547.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402960/normal_601eb1ead952d.pdfIn PDF document text
    • https://jixusalozexifan.weebly.com/uploads/1/3/1/4/131407855/6376278.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/gajaxiboduja.pdfIn PDF document text
    • https://xidumalebuwun.weebly.com/uploads/1/3/4/8/134894794/ba980fb155c1.pdfIn PDF document text
    • https://guxumexowe.weebly.com/uploads/1/3/3/9/133999944/kalipenudopas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_d406db72ab0d43bdbde986e76c239363.pdf?index=trueIn PDF document text
    • https://8319d365-0190-44ee-b2f3-e76f6fd230eb.filesusr.com/ugd/112488_3f352020b8dc480c84ba8a3def821317.pdf?index=trueIn PDF document text
    • https://cfff6b0e-fc0f-4d9c-a983-c0e60c8b2bfd.filesusr.com/ugd/c637e3_0f335a8000c748cf859eeb13bb02593c.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_off0000f42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42D 5164 bytes
SHA-256: b3dec34da1e0d60e155973b30e47090310d35c9ab1d7aab64866fdb0d89d8b71
font_01_sfnt_off000105af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AF 11968 bytes
SHA-256: cfaf419a150d06bed97e02f4a9ae826f60c1c2caf37b14bcf554d972c248cab7