Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e21284b4eb52b4d…

MALICIOUS

PDF

83.4 KB Created: 2021-05-31 01:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f536c839bb6af38addfd881149dec518 SHA-1: 506f3b0d36da5d94dd130d8e4ec07fbd03bee000 SHA-256: 0e21284b4eb52b4de509526ddb7507d26a487a1f8197f69ac938d609a9cb3bc3
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm or SEO manipulation scheme. The primary URL points to a resource related to 'congestive heart failure ppt', which is likely a lure to attract clicks to the link farm.

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
  • 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://fokemale.ru/123?utm_term=congestive+heart+failure+ppt PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4498324/normal_5fc7faa1f31f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450251/normal_6034eb135bda6.pdfIn PDF document text
    • https://xemilesexevig.weebly.com/uploads/1/3/4/2/134266110/xukilanudodet.pdfIn PDF document text
    • https://tomoniwibisuxis.weebly.com/uploads/1/3/5/9/135961627/butuwakiluwo-lobebemopa.pdfIn PDF document text
    • https://xuduburuk.weebly.com/uploads/1/3/4/3/134323667/bubonovepepoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478670/normal_6038420f5acdb.pdfIn PDF document text
    • https://rafogemi.weebly.com/uploads/1/3/4/7/134754229/c57156d3221cb16.pdfIn PDF document text
    • https://voxuvuru.weebly.com/uploads/1/3/5/3/135390020/6732015.pdfIn PDF document text
    • https://dixawofira.weebly.com/uploads/1/3/5/3/135303501/35d40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379744/normal_606a8aa277b6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424361/normal_5ff144371a682.pdfIn PDF document text
    • https://jakidanumamew.weebly.com/uploads/1/3/4/8/134881834/winatitufotojez.pdfIn PDF document text
    • https://muxapikaw.weebly.com/uploads/1/3/5/3/135346573/8973093.pdfIn PDF document text
    • https://porujigiwafixuf.weebly.com/uploads/1/3/4/3/134373975/ragerobafevalev.pdfIn PDF document text
    • https://zilavexeredora.weebly.com/uploads/1/3/0/8/130874610/4735227.pdfIn PDF document text
    • https://mubuwejazanewa.weebly.com/uploads/1/3/4/5/134585617/9735312.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488329/normal_60502a934d99e.pdfIn PDF document text
    • https://kololeranazi.weebly.com/uploads/1/3/4/5/134583506/gelinisowa.pdfIn PDF document text
    • https://fuxovibafisiboj.weebly.com/uploads/1/3/0/8/130874455/kagaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416139/normal_601b1d531bb4c.pdfIn PDF document text
    • https://kenawogerawe.weebly.com/uploads/1/3/4/5/134593039/4693851.pdfIn PDF document text
    • https://warigiwedekepap.weebly.com/uploads/1/3/4/6/134655399/8519144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368750/normal_6016448adec32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450039/normal_601df9bed646a.pdfIn PDF document text
    • https://divopugizupuja.weebly.com/uploads/1/3/4/4/134487222/pipazaxoruzaresavum.pdfIn PDF document text
    • https://zopogunonezaso.weebly.com/uploads/1/3/1/6/131637395/8209370.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368496/normal_5fc8b3ca917a6.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_off00010a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4B 5128 bytes
SHA-256: 9da310f8d004f3e58edaeb9e7ce4ba3e5e2f75a564f8dbb1d3beaf8687b4f98f
font_01_sfnt_off00011bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC5 10684 bytes
SHA-256: ee50028351cf0146ef0ca662cea8592dd7764f31b83d9b88bc9215a14d3ea001