PDF malware analysis — malicious · 80712857167b7b6c

MALICIOUS

PDF

77.9 KB Created: 2021-03-24 14:20:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10

MD5: 2716687e7d9daba988fa9b086acd7ab5 SHA-1: 2839d6952d26509d408ff9898ec04b915840cb70 SHA-256: 80712857167b7b6cb021829c1761fd638a1672bb316b86f0cd01f0c0be5560fd

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=how+to+gift+wrap+diagonally PDF link annotation
- http://domsale.xyz/wekabimosajavutuxosesexe4dtvg.pdfIn PDF document text
- http://bizarur.iblogger.org/damumexubirifukipijuxu.pdfIn PDF document text
- https://cdn.sqhk.co/dagorabowixu/bges589/37682009390.pdfIn PDF document text
- https://rewajugelawuz.weebly.com/uploads/1/3/0/7/130738764/17df1a.pdfIn PDF document text
- https://cdn.sqhk.co/zifiguwosu/cvjahjI/acrylic_nails_ideas_long.pdfIn PDF document text
- https://razavewi.weebly.com/uploads/1/3/0/8/130813306/mukep_wogopuxigodoji.pdfIn PDF document text
- https://cdn.sqhk.co/gotulurowav/mihfGeB/boxing_combat_magnolia.pdfIn PDF document text
- http://biweekamnf.com/758461512581ekv8.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://e321b6f2-2a0a-4c58-8c60-26baf46d82f1.filesusr.com/ugd/14900c_c918f6132a62487bab78f4956cfe2fd0.pdf?index=trueIn PDF document text
- https://b73b9701-b1df-43be-b031-73419f87697c.filesusr.com/ugd/bfbd96_7c7a4a724bc544be99f52fb929e748f4.pdf?index=trueIn PDF document text
- http://wadobenozunon.rf.gd/bsb123_data_analysis_research_report.pdfIn PDF document text
- http://konoxebajokebu.rf.gd/guwum.pdfIn PDF document text
- http://tisenunab.rf.gd/bg_phonetic_xp_free.pdfIn PDF document text
- https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_72255599268849d38cbf09fe7bd7ae53.pdf?index=trueIn PDF document text
- https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_15148578c9f04cfc94e7bbe3ccc26d23.pdf?index=trueIn PDF document text
- http://zivufev.rf.gd/sololearn_css_shortcut_answers.pdfIn PDF document text
- https://9305c775-266c-4126-9ef9-90a5cffee957.filesusr.com/ugd/c3f88d_e0b847b103e5488c9322ac642f8d8e5d.pdf?index=trueIn PDF document text
- https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_e4a552d324524555809652f9bdf90e29.pdf?index=trueIn PDF document text
- https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_9c6d0b8ee4804c39b2b9886ee6c10550.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e8b1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8B1	5184 bytes
SHA-256: `18655053d58430d9d8c4a3b2da97dd0fd60c880bb6b9b983a56c70ac431346fc`
`font_01_sfnt_off0000fa7d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA7D	1680 bytes
SHA-256: `8b97c1f8923aca8395c83c40d824c403a95f1c5313e985c3087d813186ef55f8`
`font_02_sfnt_off000102eb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102EB	11572 bytes
SHA-256: `c8e6549233e555ac71fe85dd7935f06a5d30120c69a7c9f4f6a0b6cdf4b2a7be`

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