Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e1dfce99583694…

MALICIOUS

PDF

75.4 KB Created: 2021-02-05 00:49:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 86b137e4647cf8917ee5cc051638af60 SHA-1: 4911b95a5ecc707ccf09c4c09a9dcd6f55a0a8b4 SHA-256: 36e1dfce9958369420d410604336627c35ea1a171fb25b60fcc0715b71bae769
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to suspicious domains and are flagged as malicious redirectors or part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=what+does+whimsical+tone+mean In PDF document text
    • https://sefedajexoxoj.weebly.com/uploads/1/3/4/4/134479396/5490554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425933/normal_601651b857a47.pdfIn PDF document text
    • http://logoped-samara.ru/paola_turbay_e_diego_sotorqmxr.pdfIn PDF document text
    • https://rimofemosi.weebly.com/uploads/1/3/4/3/134351632/mitawemawitujidik.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/el_pequeC3B1o_nicolas_resumen_por_capitulos0m085.pdfIn PDF document text
    • https://lakerevuko.weebly.com/uploads/1/3/4/6/134654656/niluvurazipubakowam.pdfIn PDF document text
    • http://copyrightsupporteds.com/42752699784064hj.pdfIn PDF document text
    • https://fanedidunosav.weebly.com/uploads/1/3/5/3/135345804/magonarunudobinalup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480895/normal_60036b8697afa.pdfIn PDF document text
    • http://jobs-ingenieur.best/city_gangs_san_andreast67ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369916/normal_600493c701b32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412773/normal_600606a3cde16.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/acca_p7_examiner_report_december_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/sixufeto.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/vifonuvesagixipanoxe.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/butolo.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/13817517734.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/40125524769.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_off0000e92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 5188 bytes
SHA-256: 9e96637a12166d6ca1ba4c20b1b493c06416cb7731f538bfa38ffa4bdbc37952
font_01_sfnt_off0000fac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC7 11164 bytes
SHA-256: f3458a7b8e4b71a27b016600b8f79c23c55c7f213622628b8b529192952be778

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