Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8ae7ae1f6f0b39…

MALICIOUS

PDF

88.5 KB Created: 2021-05-22 01:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 02b0fbf6286f2a1f816763d109bfe813 SHA-1: 67baa1a13d8af1abd726d9e18780efdcbc3913e3 SHA-256: 5a8ae7ae1f6f0b39677d07f387a6de36bbb5ac049f17c2f3a10511a337d3b598
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links pointing to various external websites, many of which appear to be part of a link farm hosted on disposable infrastructure. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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/wb?keyword=how%20to%20power%20off%20ipod%20nano%206th%20generation In PDF document text
    • https://static.s123-cdn-static.com/uploads/4368246/normal_5fec92276fbc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369324/normal_602b083f37d51.pdfIn PDF document text
    • https://wikumegi.weebly.com/uploads/1/3/1/4/131407968/4800587.pdfIn PDF document text
    • https://rimovume.weebly.com/uploads/1/3/1/4/131452953/744b654.pdfIn PDF document text
    • https://suludexa.weebly.com/uploads/1/3/5/3/135314517/nomob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382187/normal_600be71d24b45.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372076/normal_5ffb4d7b0b6ec.pdfIn PDF document text
    • https://wugovokida.weebly.com/uploads/1/3/4/3/134319073/98142b187.pdfIn PDF document text
    • https://tiwilofudux.weebly.com/uploads/1/3/1/6/131606348/zewoxapuvov-wujen-zobakerugosak-nebesale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366647/normal_6010b62756b9e.pdfIn PDF document text
    • https://lokamafurixese.weebly.com/uploads/1/3/4/5/134509290/7588762.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365584/normal_5febd83ea367e.pdfIn PDF document text
    • https://regafuraseni.weebly.com/uploads/1/3/4/6/134663643/kirotuvelodopimak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374682/normal_5ff1b5ff09cd0.pdfIn PDF document text
    • https://ligofaxudatejot.weebly.com/uploads/1/3/0/7/130739538/5824399.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449777/normal_601384843ae87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499979/normal_5fd1b6ca44a3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448746/normal_604ba94c7f20c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415065/normal_5fe069be651fe.pdfIn PDF document text
    • https://jitifawe.weebly.com/uploads/1/3/5/3/135327084/sipazufufi-todonopus.pdfIn PDF document text
    • https://zevijilutijeso.weebly.com/uploads/1/3/4/8/134850931/ruvizolanuput.pdfIn PDF document text
    • https://xatiletovolut.weebly.com/uploads/1/3/1/4/131409128/lizegevadigixur_naxepepizofu_zewimimaxanuziz_nataluteka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460950/normal_6036dec343701.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370080/normal_5fe0f00e66618.pdfIn PDF document text
    • https://vomalokigalexa.weebly.com/uploads/1/3/4/3/134329787/berojilelabufixaxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445325/normal_6008b1866cc08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413982/normal_603954ee53f8f.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_off00011c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9A 5300 bytes
SHA-256: 560ca30cca4d713b0d294a07705ff6fae8c80296406d1132f6a0ec1f25d10154
font_01_sfnt_off00012eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB0 10916 bytes
SHA-256: 2c5dd239d5903e609a35cb6dc7aac812497955dd926fa64b237a306565fa18e8