PDF malware analysis — malicious · 4b8a5700b0dc90a5

MALICIOUS

PDF

81.5 KB Created: 2021-03-29 00:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27

MD5: 5d57e38e2b88f877773b759b0c2ad65d SHA-1: 8431e4963f8713e9a387406e5c4f333db42fb5e2 SHA-256: 4b8a5700b0dc90a5635e4e26dcb2a708ff4e0ea46a01f66525fc0c0ea8c2d71a

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and is flagged by ML and ClamAV as malicious, indicating a phishing or malware distribution attempt. The presence of embedded URLs and the structure as a link farm suggest the primary goal is to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF format can embed JavaScript, which is often used for malicious redirection or exploitation.

Machine Learning

Nyx PDF Classifier malicious score 0.9992

Heuristics 5

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 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://seumenha.ru/strik?utm_term=samsung+un50ku6300fxza+remote PDF link annotation
- https://cdn.sqhk.co/wujukipako/kpKUsjb/shell_v_power_racing_fuel_discount.pdfIn PDF document text
- http://shoppingyxplus.xyz/how_to_train_your_dragon_2010_dvd_menu_walkthroughakz8h.pdfIn PDF document text
- http://fibaxoxadomi.sportsontheweb.net/free_diy_chicken_coop_plans.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4484612/normal_5fcc0a737dac5.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4445570/normal_6014695a953bd.pdfIn PDF document text
- http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
- http://lubenoredeji.mypressonline.com/99138971261.pdfIn PDF document text
- http://prizinsta24.space/879544117929zv8j.pdfIn PDF document text
- http://sinoxaju.mygamesonline.org/jirir.pdfIn PDF document text
- https://cdn.sqhk.co/sitopizol/DIhepXV/34231608412.pdfIn PDF document text
- https://cdn.sqhk.co/mazavanov/SMhEi6Q/bladder_infection_home_remedies_during_pregnancy.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4489852/normal_5feb08f0b118e.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4475864/normal_5fca2e2488d09.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4459483/normal_5fd9c095a42dd.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4377935/normal_601336218810d.pdfIn PDF document text
- https://cdn.sqhk.co/widafopaj/X0RgcHS/geravu.pdfIn PDF document text
- http://priz24.site/122766938178lczd.pdfIn PDF document text
- http://stopro.store/13920024436xb35t.pdfIn PDF document text
- https://cdn.sqhk.co/sururezog/wIiicgr/internet_speed_meter_lite_pro_mod_apk.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_358969c3dc9c4181ae0ded84b37a2ba3.pdf?index=trueIn PDF document text
- http://tefetuzuzip.myartsonline.com/what_poetic_devices_are_used_in_the_poem_man_of_earth.pdfIn PDF document text
- https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_b35be5222d2140aab5daae044f635a47.pdf?index=trueIn PDF document text
- https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_5a891850f2494697b53eb387d77711fc.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_off0000e5fd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5FD	5924 bytes
SHA-256: `2a36c51df043a462795e51a7e52a1a4404c6c7fc7604e3fae1b668c056f82491`
`font_01_sfnt_off0000fa1f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA1F	11532 bytes
SHA-256: `34cbda6c27a61050968f0fcbde5c670af6cbad8943eafca5ae5093f6973aac97`
`font_02_sfnt_off00012187.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12187	16204 bytes
SHA-256: `532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e`

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