Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cad1cef58016e12…

MALICIOUS

PDF

77.7 KB Created: 2021-04-23 11:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5a8e27b39b3ea036525e6fd5c1fa9985 SHA-1: 6f146cfa3d2bc0556e7d01addb6e2849e9df93b6 SHA-256: 3cad1cef58016e12a4ddc2b92096ff8481146f35bce2dadd17b6a0f0102b7c3e
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/strik?utm_term=diary+of+wimpy+kid+new+book+2021 PDF link annotation
    • http://buyfastedcircle.xyz/vuvoperi0jy35.pdfIn PDF document text
    • http://teagreen.space/pozujalalujalidejejadedaurl8f.pdfIn PDF document text
    • http://topmassage.net/10871714958sf97l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448339/normal_605370048a34a.pdfIn PDF document text
    • http://milano-moda.space/tandy_1650_computerized_chessc0g7u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_600bf01f4d290.pdfIn PDF document text
    • https://soberonapi.weebly.com/uploads/1/3/2/6/132681790/8879084.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449777/normal_606de4c565d97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476758/normal_5fe16c9061dce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370080/normal_604eb6b275c0a.pdfIn PDF document text
    • https://xedijekotaz.weebly.com/uploads/1/3/1/6/131606072/wazujodadaperusuji.pdfIn PDF document text
    • https://cdn.sqhk.co/zabadiripo/fnghjh3/77702880046.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391909/normal_5ffc314a29cb6.pdfIn PDF document text
    • https://nimosawi.weebly.com/uploads/1/3/5/9/135982357/3093957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493195/normal_601e9183d4ef8.pdfIn PDF document text
    • https://cdn.sqhk.co/nowagenika/f8gchg7/4845051840.pdfIn PDF document text
    • https://bizitodavil.weebly.com/uploads/1/3/4/3/134321392/filib.pdfIn PDF document text
    • https://cdn.sqhk.co/wedifedaguju/jhgejht/the_joker_hd_pictures.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482860/normal_600f57d861ae6.pdfIn PDF document text
    • http://neyroskakalka.site/what_cases_fit_ipod_touch_5th_gen8hlpu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387929/normal_600bc59b0e924.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/mutirexa/vetusurowadepagawiwoki.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/jomanoja.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_off0000ee13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE13 5700 bytes
SHA-256: 6b9aff6cd5114c65afcfa1d2b766a09504ce124009fa1c541db249095cae5782
font_01_sfnt_off00010192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10192 11308 bytes
SHA-256: 191d75d703fa9b8140cfb0ea5810a1fda4da2bf568e6ef8c3fd0048f117cf360

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