Malicious PDF — malware analysis report

Static analysis result for SHA-256 edcb2351b9d16ada…

MALICIOUS

PDF

74.9 KB Created: 2021-05-27 17:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8bcdbf73f500febb843c0d5a98198e00 SHA-1: cfb100ea47952838a3f0a100b18d0e86bc198398 SHA-256: edcb2351b9d16ada802821dd67d686bd0d3d3053862d994f041d14710386db5e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the document's structure point towards an attempt to exploit users seeking specific content, potentially leading to credential theft or further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://druttle.ru/strik?utm_term=los+hermanos+karamazov+pel%25C3%25ADcula+online+subtitulada PDF link annotation
    • https://motanufogok.weebly.com/uploads/1/3/1/3/131381166/9781404.pdfIn PDF document text
    • https://fufigejopugip.weebly.com/uploads/1/3/1/0/131070204/logubuxowipu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368471/normal_600bb18e1f9b8.pdfIn PDF document text
    • https://lusulabudigesa.weebly.com/uploads/1/3/2/6/132681481/tunajabu-wesopuma.pdfIn PDF document text
    • https://muxilakenakujud.weebly.com/uploads/1/3/4/0/134012833/5364281.pdfIn PDF document text
    • https://bumifofo.weebly.com/uploads/1/3/4/5/134598811/jigikenupexadu-rufalirisux-xudamovivos.pdfIn PDF document text
    • https://ligofaxudatejot.weebly.com/uploads/1/3/0/7/130739538/3e1db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446924/normal_606598c7e14b3.pdfIn PDF document text
    • https://nuruvubapifak.weebly.com/uploads/1/3/1/4/131452890/e847eaf2f.pdfIn PDF document text
    • https://kivexobine.weebly.com/uploads/1/3/4/8/134859900/3790383.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388428/normal_5fec91f5e6488.pdfIn PDF document text
    • https://nenuvive.weebly.com/uploads/1/3/1/4/131483155/02487b.pdfIn PDF document text
    • https://novafonofijufi.weebly.com/uploads/1/3/4/4/134480525/ruzugewazen-foganodapaxuvir-perajolokofomid-funutapib.pdfIn PDF document text
    • https://sejelenowoloza.weebly.com/uploads/1/3/4/5/134518320/dcd669e30f042.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/43a8211e-d6cf-4257-bb96-132761a664ac/digi_002_driver_mac_high_sierra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8db2dc2c-d3c3-4d71-b30c-c0ac98bc7e8f/diruxirig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f4c6dcd-4b01-42dc-9218-f8df02d018dd/iso_27002_version_2013_free_download.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_off0000e3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B9 5624 bytes
SHA-256: 988c825863ec7aa748ee3cb7d9b53e3d806c3d0036f9a82c4cd9d1bff02da4c0
font_01_sfnt_off0000f6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 11344 bytes
SHA-256: add4f1447898e94b7cbab813a4c4ba3cf0a462a78a558e9b036bf6c8d104c489

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