PDF malware analysis — malicious · b23b2fc31c0a87d2

MALICIOUS

PDF

96.7 KB Created: 2021-04-04 10:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07

MD5: e5be5016f7e647b7b287c9fcbf1e3293 SHA-1: 4366ff408117aaed93f0fdab7e7f0af2ccb40f4f SHA-256: b23b2fc31c0a87d2b8b0da60a33a7ea9002a57bcd7ed5b9f956d8fbce7c22f21

124 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic indicating it is a link farm, with numerous external links, one of which is a search result for 'Google sites free themes'. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the 'SE_INVOICE_LURE' heuristic suggest a phishing or scam attempt to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9992

Heuristics 6

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
Fake invoice / payment lure low SE_INVOICE_LURE

Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
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://maypoin.ru/wix?keyword=google+sites+free+themes PDF link annotation
- https://bomupafevusoze.weebly.com/uploads/1/3/1/4/131407549/makozubap-mibutoz-zimajaxumamiv-papugajosodup.pdfIn PDF document text
- https://diwodineguxep.weebly.com/uploads/1/3/4/3/134305573/zupaxademovovodu.pdfIn PDF document text
- https://cdn.sqhk.co/riwutosax/ghijigG/pupuf.pdfIn PDF document text
- https://numetigovav.weebly.com/uploads/1/3/1/6/131606493/zagifimuki.pdfIn PDF document text
- http://trikotoria.ru/38408546340ztp3p.pdfIn PDF document text
- http://slimerecipe.org/akeelah_and_the_bee_english_subtitles580o4.pdfIn PDF document text
- https://wimukesogizat.weebly.com/uploads/1/3/4/6/134639197/purafirom.pdfIn PDF document text
- http://iranomics.com/pathfinder_character_sheet_fillablepcasy.pdfIn PDF document text
- https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/d7bbcea70f92e75.pdfIn PDF document text
- http://copyrightsupporteds.com/how_to_wire_comfort_zone_heater8f5fl.pdfIn PDF document text
- https://cdn.sqhk.co/weteroliwo/d1jc0ij/head_soccer_game_unblocked.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/likerajatob/82629925185.pdfIn PDF document text
- https://s3.amazonaws.com/nosepevozux/dodidonowikiki.pdfIn PDF document text
- https://s3.amazonaws.com/kalanejaxutilif/23816713520.pdfIn PDF document text
- https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_696ce7d783144fe59a2a69aec2ba614c.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/kalanejaxutilif/67743429023.pdfIn PDF document text
- https://s3.amazonaws.com/kukazowox/54755765085.pdfIn PDF document text
- https://s3.amazonaws.com/mupukesunobaga/carrinho_de_carga_plataforma_em_inox.pdfIn PDF document text
- https://s3.amazonaws.com/mogipegi/agency_agreement_completion_guidelines_checklist.pdfIn PDF document text
- https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_31d3908cd43644ce90455c3ba8015c96.pdf?index=trueIn PDF document text
- https://dcc20dec-0195-4543-b617-cfb82efd15f0.filesusr.com/ugd/30ea26_788abb47c82b473eafc0e4a6f1dfe1ec.pdf?index=trueIn PDF document text
- https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_2755d53c7b0c46e89d04ee4782e26867.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/roxawo/tojijofumajatijepoguxu.pdfIn PDF document text
- https://f43304fd-85e4-489a-8612-81977e01be4a.filesusr.com/ugd/b6f504_d90b4ea4344d40b5a174d85377bb51bc.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00013ab1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13AB1	5000 bytes
SHA-256: `8cfa5989283bffa2c566f3963769de492e2fe3ae671a6a2d1fb4ece5ba06d7d8`
`font_01_sfnt_off00014b95.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14B95	12284 bytes
SHA-256: `83ff8cf6f070500f225d51b92f4a3135d20c408b009c1bf648b584fdaa7cae6a`

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