Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1ef9fbbfe8fed8…

MALICIOUS

PDF

77.7 KB Created: 2021-05-20 19:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3eaa1110b004db941cd89151ca4005ad SHA-1: 14a1f51928838c185028c3bedd3bbb4833dc81db SHA-256: 4d1ef9fbbfe8fed896fc21534d97cc3c8bbd35466f699c254205a00b9a30770e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/strik?utm_term=how+do+you+announce+a+promotion+in+an+email PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426279/normal_5feb716b87d75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497110/normal_606a369221939.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388422/normal_5ff276b252672.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390999/normal_5fdda9ee0bc94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420014/normal_5fc6fad4b1d36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_606dfd03924e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482020/normal_5fd2636fc8f82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467278/normal_606234654178c.pdfIn PDF document text
    • https://binazinir.weebly.com/uploads/1/3/4/1/134108718/lofogi.pdfIn PDF document text
    • https://pomujitumigo.weebly.com/uploads/1/3/1/8/131857402/9669886.pdfIn PDF document text
    • https://nunesevafarub.weebly.com/uploads/1/3/0/8/130874378/wusopezefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483842/normal_602be9822deb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501656/normal_6055bec49e134.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462339/normal_5ff6667529e95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388611/normal_60109c654bbc7.pdfIn PDF document text
    • https://suxewanevot.weebly.com/uploads/1/3/4/5/134595646/3f020.pdfIn PDF document text
    • https://suwanofanezelon.weebly.com/uploads/1/3/1/6/131636577/tosalamiwe.pdfIn PDF document text
    • https://rozutawupev.weebly.com/uploads/1/3/2/6/132695629/buxasekenip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 5196 bytes
SHA-256: 4078b87645e2537fd201df90f27da07129a6be8ae72a4b2149411f02687e5fc9
font_01_sfnt_off000102d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D1 11400 bytes
SHA-256: 7571ff2385b1dccdd02f6beed1c321ea54f5c6b5b2f306f8ebc6802dec9bcf91

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