PDF malware analysis — malicious · 3eec9e04ce5c5bbf

MALICIOUS

PDF

86.9 KB Created: 2021-03-19 11:16:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07

MD5: 65929c6336706b8a3e2f30b2ac688d19 SHA-1: d0f70a94ba704272b5e5f5ce8c3a3d4c343d4ede SHA-256: 3eec9e04ce5c5bbf4752dca1a9ccc066340b18c3fbe5dead9d2d83c988b42419

126 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 hosting, suggesting a link farm or SEO spam operation. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection attempt, likely initiated via spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 5

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://resalured.ru/award?keyword=english+story+pdf+book+download PDF link annotation
- http://shimano-stradic.ru/prefix_and_suffix_worksheets_for_5th_grade4vhy3.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4446400/normal_602f503155f14.pdfIn PDF document text
- http://8gusevshop.website/dupegjo44b.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4403822/normal_60093e7c97d89.pdfIn PDF document text
- http://safetymirrors.xyz/861520367485grqs.pdfIn PDF document text
- http://carluxepaint.site/1920s_does_this_political_cartoon_symbolizeqagdv.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4374189/normal_60312dcc8adf2.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4452169/normal_5ff9ce838f575.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4479236/normal_604d1845cc803.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4375194/normal_5fc732537dd81.pdfIn PDF document text
- http://zoomita.space/star_wars_movie_download_in_hindibp330.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://uploads.strikinglycdn.com/files/9c41aa23-6294-405f-9737-3dd4910678c2/make_your_own_business_cards_print_at_home.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/58528efa-8b30-4f7f-9c1c-497322e3bc98/xekeradutitutu.pdfIn PDF document text
- http://jufulejilola.epizy.com/police_informant_list.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/77e49fc9-2ceb-461a-b4fc-2aa2e540d171/wunesirovazenovil.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/0fd72e0d-275c-46e3-a357-9981e556155a/binding_of_isaac_four_souls_house_rules.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/20b3ff7e-f0a5-4229-adde-d756d71aec35/demuz.pdfIn PDF document text
- http://runesufosufej.rf.gd/viwukikaxoradimifakez.pdfIn PDF document text
- https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_ef747b91ddbe4cfbadc98517141a00a0.pdf?index=trueIn PDF document text
- https://7605c768-a471-4169-85a9-0dab509fd250.filesusr.com/ugd/20ab23_43c1ee406e58478f9589ccdfe2c1fb3b.pdf?index=trueIn 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
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f84b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF84B	5656 bytes
SHA-256: `3ba17ccbecc0a732ff640cae0755a0ec8b399842bf33fe7a5a3ef56ad25eb64c`
`font_01_sfnt_off00010ba8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BA8	10612 bytes
SHA-256: `b27e544f6628d425c8b46e325d97a440d12916c7fa775745a6362435e12c6b2a`
`font_02_sfnt_off0001300f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1300F	18696 bytes
SHA-256: `00cba06faa81c4e31af6fd6d8d5520489a88d4552e81138127c3e14bf6ee244c`

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