PDF malware analysis — malicious · 86c928e6f691979a

MALICIOUS

PDF

76.2 KB Created: 2021-06-04 11:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: 278aff73274557b9e7519a0d91672143 SHA-1: 21d3679adec3428cccf0baf7ad5d5c8d44e5b402 SHA-256: 86c928e6f691979a4b04b9ae24be53e7e1156049c16d0d2da04c208dc4106517

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

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://allytemp.ru/pbw?utm_term=adjective+and+adverb+phrases+worksheets PDF link annotation
- https://cdn-cms.f-static.net/uploads/4422659/normal_604b36cdd6393.pdfIn PDF document text
- https://milanabez.weebly.com/uploads/1/3/2/6/132695465/wafaruravomopute.pdfIn PDF document text
- https://static.s123-cdn-static-d.com/uploads/4381083/normal_60b5ff845ff5d.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4367304/normal_600db70b0b325.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4470545/normal_6024392ecaac5.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366406/normal_604620d99c37c.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4378855/normal_606e38c140d45.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4446511/normal_5ff1cff46df93.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4374979/normal_5fd3c8b122833.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4428052/normal_5fe5d6736b44a.pdfIn PDF document text
- https://sokotomajav.weebly.com/uploads/1/3/4/0/134040389/1915b76.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://kigemulu.pbworks.com/f/65399323392.pdfIn PDF document text
- http://sokulus.pbworks.com/f/59469902264.pdfIn PDF document text
- http://gapufipi.pbworks.com/f/gidilamalel.pdfIn PDF document text
- http://viluxese.pbworks.com/w/file/fetch/144414156/names_for_pubg_generator.pdfIn PDF document text
- http://kapetipubi.pbworks.com/w/file/fetch/144421644/un_lugar_en_silencio_2_fecha_de_estreno_peru.pdfIn PDF document text
- http://gemometis.pbworks.com/w/file/fetch/144512961/32299177067.pdfIn PDF document text
- http://pokatufaxi.pbworks.com/f/guwevoweripivodoketozebu.pdfIn PDF document text
- http://vifogajo.pbworks.com/w/file/fetch/144499296/how_to_write_an_email_to_client_asking_for_documents.pdfIn PDF document text
- http://xobapotowi.pbworks.com/w/file/fetch/144558696/warning_signs_of_getting_dumped.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dca6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCA6	5340 bytes
SHA-256: `6a7301412cf4842e7535e17eb142832d7ed9c28ac276187966b5dbe4a584fc86`
`font_01_sfnt_off0000eec6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEC6	10892 bytes
SHA-256: `8c41f9c391810f98e578ce7899c86632cc26d1a1ef4883dfe6e390a28b164ce9`
`font_02_sfnt_off000113bc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x113BC	4324 bytes
SHA-256: `9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2`

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