Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e75eeb32bdeedfb…

MALICIOUS

PDF

45.0 KB Created: 2020-11-03 23:24:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: da7fbcb588b3bc73adf383e725972a95 SHA-1: 35d05e93d48037d0271afb22f512f496daab9b80 SHA-256: 5e75eeb32bdeedfba069878ae774bde155e609d3048b439741bff03e603bc1c1
244 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 pointing to disposable hosting services, and one specifically to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the SE_BRAND_CREDENTIAL_PHISH heuristic confirms a lure impersonating Apple. The embedded URLs likely serve to distribute further payloads or lead to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/3787719.pdf.
  • 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.
  • 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://cctraff.ru/strik?keyword=the+backup+plan+movie+free+online In PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/3787719.pdfIn PDF document text
    • https://tokuguzeg.weebly.com/uploads/1/3/4/4/134464653/9621410.pdfIn PDF document text
    • https://fugubujezowegi.weebly.com/uploads/1/3/4/5/134502495/vunawileziwufa_vikaguzu.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/d069c180a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f9945d93db6d.pdfIn PDF document text
    • https://getedizexagan.weebly.com/uploads/1/3/0/7/130740146/c12ab.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/052c2f5.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/4975983.pdfIn PDF document text
    • https://zinikedefi.weebly.com/uploads/1/3/0/7/130740178/vosimu-redibelefavepu-nufid-tixugikigupiv.pdfIn PDF document text
    • https://jikeberu.weebly.com/uploads/1/3/1/8/131857846/6edccb6bb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383321/normal_5f91f9b930519.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/jamokaroxoj/panduan_belajar_bahasa_thailand.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/12615027699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39af3b77-7465-406e-9e7e-8a6231267fdf/netifot.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_off0000717a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x717A 5288 bytes
SHA-256: c12fcd7bdc6e0eb5766413d6334c46f09354681e059adaad75044c675dbf1d33
font_01_sfnt_off00008357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8357 10468 bytes
SHA-256: c6a4c89198b7360a4c67f89577e7fa098c7fc5d81f7df688ab9274d685618597

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