Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50e0fe4c461e2b1…

MALICIOUS

PDF

89.0 KB Created: 2021-04-12 07:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: bad875a99c31410eff946fd46d0e9e49 SHA-1: ae6a600cf8f826b76a78f973abb6e3ae1c3c0f5d SHA-256: e50e0fe4c461e2b1aa5f5c6e551c02b68cfb13a22c6d6371855b3cc5412c60af
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were extracted, the embedded URLs and the nature of the link farm point towards an attempt to redirect users to malicious or deceptive content, likely for phishing or malware distribution.

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://nipisod.ru/strik?utm_term=arnold+ehret+dieta+uzdrawiaj%25C4%2585ca+bez+%25C5%259Bluzu+pdf PDF link annotation
    • http://surupumigo.mypressonline.com/ley_1080_de_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_6050304367e26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467564/normal_606ccb2f8b10b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414848/normal_6024c7a439dd9.pdfIn PDF document text
    • http://top-agent.ru/the_memory_book_harry_lorayneywsnw.pdfIn PDF document text
    • http://zumbayuliya.online/neworapebitujekumeqs5s5.pdfIn PDF document text
    • http://ru-1.casa/how_to_lower_fisher_price_jumperooeu0ml.pdfIn PDF document text
    • https://vokedovewugom.weebly.com/uploads/1/3/5/3/135349322/216219.pdfIn PDF document text
    • https://likizosuzi.weebly.com/uploads/1/3/4/8/134886942/6c486ba3a0ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471464/normal_601ba8d2e2667.pdfIn PDF document text
    • http://parhelifrl.space/free_avast_for_windows_7_offlinew4on1.pdfIn PDF document text
    • https://tunikasas.weebly.com/uploads/1/3/1/4/131438809/lajanigox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410954/normal_5fd8ff572f74e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453730/normal_5fe5bd075e891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497695/normal_603a78aa5ad19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374374/normal_5fe5b3ffdd32d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421970/normal_606936dcaf7e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6731adf0-0bfb-4e29-9024-dbf0b6c78d19.filesusr.com/ugd/163ed7_4503fbcf5b9146e08262b883dfbfd216.pdf?index=trueIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_ab3f9e3a549f4a61ade2fe96305445b7.pdf?index=trueIn PDF document text
    • https://704d67de-a0ba-412a-a77d-f8c4cf0d88a3.filesusr.com/ugd/a83d94_a77bdd3fd816432c92ed42d067b6424e.pdf?index=trueIn PDF document text
    • https://e8e87dc5-637d-47ba-9de6-e7d98d123d78.filesusr.com/ugd/a69a03_dbb37e58b80d4c118a4cb6d74e70c777.pdf?index=trueIn PDF document text
    • http://leparitupoxow.onlinewebshop.net/27354308943.pdfIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_e89248ecadb946d99260acc75aefec1f.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_off000119a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A7 5888 bytes
SHA-256: 2bd8e1729f878306e3c4793b67944ff615e25feb606cf374e278f9bd788cc6c3
font_01_sfnt_off00012d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D30 12064 bytes
SHA-256: fe6773a4e2cfe8b66e82978c5699fc4d400712586f7a0ffbf0066aeaef976c79