Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec1f73127602e654…

MALICIOUS

PDF

76.5 KB Created: 2021-05-28 14:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0ce720553dc2cb108c015431091aee4e SHA-1: 48f79d082464b019b1d5d2709b3fe8845c5144ef SHA-256: ec1f73127602e65491a62dbec7bd99df04b763eb229a6663d1433937874d3adb
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, and also detected by ClamAV. It functions as a link farm, containing numerous embedded URLs that likely lead to phishing sites or further malware. One specific URL, https://dafemum.ru/strik?utm_term=naruto+vs+bleach, is flagged as a redirector to known malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://dafemum.ru/strik?utm_term=naruto+vs+bleach In PDF document text
    • https://cdn-cms.f-static.net/uploads/4407997/normal_6038f96eb8d62.pdfIn PDF document text
    • https://mewodufupojapoz.weebly.com/uploads/1/3/1/8/131857890/tajovikozis.pdfIn PDF document text
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/6423165.pdfIn PDF document text
    • https://pomixorum.weebly.com/uploads/1/3/1/6/131606605/revugekenikasik.pdfIn PDF document text
    • https://kesozelakix.weebly.com/uploads/1/3/5/3/135300748/komitamebonod.pdfIn PDF document text
    • https://naxutaper.weebly.com/uploads/1/3/7/5/137500597/zixakixuji.pdfIn PDF document text
    • https://zojujevekuki.weebly.com/uploads/1/3/0/9/130969212/922fc0e2.pdfIn PDF document text
    • https://nofakefol.weebly.com/uploads/1/3/4/3/134341926/3731345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427538/normal_602ebc37ed808.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489969/normal_5ff26f6b5657c.pdfIn PDF document text
    • https://wenabavur.weebly.com/uploads/1/3/1/3/131379405/e038b02a.pdfIn PDF document text
    • https://wasavegod.weebly.com/uploads/1/3/4/5/134589575/muvowewuv_pebevovujoj_murirewovato_jobegisivawoza.pdfIn PDF document text
    • https://jonilokakowoso.weebly.com/uploads/1/3/1/4/131453896/lolola_muwed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414176/normal_6032a46b8988d.pdfIn PDF document text
    • https://kivenawuvu.weebly.com/uploads/1/3/1/1/131163776/52890abb720c.pdfIn PDF document text
    • https://tajusubinem.weebly.com/uploads/1/3/4/8/134886452/a7cd4.pdfIn PDF document text
    • https://guxovegetixewaz.weebly.com/uploads/1/3/2/3/132302910/muwasisonodejopila.pdfIn PDF document text
    • https://tawojupaker.weebly.com/uploads/1/3/4/8/134885799/tupuken.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE93 4784 bytes
SHA-256: 58b7a396e76459c9670c043dc4febffa846361c6a3eb81827f2a5b22988052be
font_01_sfnt_off0000eef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF9 12520 bytes
SHA-256: 244727fef728b8863c4939ad13ef2262ca6bc67b7ac667eae833f1fa574dc6fc
font_02_sfnt_off000116d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D6 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176