PDF malware analysis — malicious · 0a97e9037692820d

MALICIOUS

PDF

76.3 KB Created: 2021-03-27 12:28:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13

MD5: 23ebcbcc3ac5ed4795fe1c760f17e561 SHA-1: bf7ab801ef28b05eac76e98df449a7cb08674799 SHA-256: 0a97e9037692820d2f18893a9588164f7560355d00ded57dad90f7b36d8487e3

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to domains flagged as disposable or unknown, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers also flagged this PDF as malicious, suggesting it may be used for phishing or distributing further malware. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.8092

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://vilenefex.ru/award?keyword=the+canterville+ghost+oxford+stage+2+pdf PDF link annotation
- https://cdn-cms.f-static.net/uploads/4417537/normal_6028106537cce.pdfIn PDF document text
- http://kimidenexikox.getenjoyment.net/79771304024.pdfIn PDF document text
- http://sasozixapedadi.iblogger.org/adulter_carte.pdfIn PDF document text
- https://pakoverixofe.weebly.com/uploads/1/3/4/7/134771358/nuzurob.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4368474/normal_5fccd127f02cf.pdfIn PDF document text
- http://beduzevitugok.mypressonline.com/genetic_diseases_book.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4418762/normal_602b22b2b06ab.pdfIn PDF document text
- https://dapobirot.weebly.com/uploads/1/3/4/8/134888013/kubunirakek.pdfIn PDF document text
- https://pupalizote.weebly.com/uploads/1/3/4/7/134716330/wumubukep-bediloraraf-sakosutonatax.pdfIn PDF document text
- https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/8625720.pdfIn PDF document text
- https://lufuwoxataj.weebly.com/uploads/1/3/1/3/131379696/4c0b8.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4420470/normal_604320033959c.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4444114/normal_5ff5cd6c19301.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_05fcf84393584b81a607a2e227c6d385.pdf?index=trueIn PDF document text
- https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_68b60feb60fa4eb79558afbc60f2db21.pdf?index=trueIn PDF document text
- https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_62db9f075c104ad9974729f445a879b7.pdf?index=trueIn PDF document text
- http://zafitubebetero.rf.gd/bokidudaw.pdfIn PDF document text
- http://livufibutimogil.rf.gd/65463768009.pdfIn PDF document text
- https://c140f178-ee45-427e-91fe-a3c5f821f67e.filesusr.com/ugd/ebc5f9_65bba8d73cbf4285a095e112e2ea336b.pdf?index=trueIn PDF document text
- https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_e9f39a81b0fb4707828b07b675a1b3b9.pdf?index=trueIn PDF document text
- http://fefetariweboxed.rf.gd/34596763372.pdfIn PDF document text
- https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_b0475571d75248f59b13c6b5a6c954ef.pdf?index=trueIn PDF document text
- https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_c32efade721540efbecd57d39dfe161d.pdf?index=trueIn PDF document text
- http://legokejapo.atwebpages.com/jatamenefufepa.pdfIn PDF document text
- http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f4d3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4D3	5624 bytes
SHA-256: `c618a1faeb0cbb4b5fe3453a24f860c04276e5c2b06e00696efe4732c92cba90`
`font_01_sfnt_off000107fd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107FD	10764 bytes
SHA-256: `3fc8f17f56981d415dbe00d91a2f08d17ada7f0cd85b459c9f32a87e48c2bed9`

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