PDF malware analysis — malicious · bf70c3e5e6878309

MALICIOUS

PDF

78.3 KB Created: 2021-01-01 02:47:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07

MD5: e012b2112b6447b3705d97040c1554aa SHA-1: 93c6482c7f172472892d67c38951dbf3d0f574e2 SHA-256: bf70c3e5e68783095dcb83118d8c2d97c24a91266d29cb0417466a268150ee95

252 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm. The ML classifier also strongly flagged this sample. The embedded URLs likely serve as lures to download further malicious content or lead to phishing sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://ggtraff.ru/strik?utm_term=skateboard+party+2+apk In PDF document text
- https://cdn-cms.f-static.net/uploads/4393364/normal_5f99a2729343b.pdfIn PDF document text
- https://cdn.sqhk.co/nunemiziku/bUgjhit/terro_ant_killer_granules_home_depot.pdfIn PDF document text
- https://cdn.sqhk.co/zivudasexoni/vhfiiVO/zambian_politics_news_now.pdfIn PDF document text
- https://xejotonevuxujuj.weebly.com/uploads/1/3/1/3/131379732/lidevenut.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4419204/normal_5fb2ba6795b79.pdfIn PDF document text
- https://cdn.sqhk.co/jetobatu/jjcE7ia/32852099699.pdfIn PDF document text
- https://bijazebis.weebly.com/uploads/1/3/1/3/131382141/zuxenafud_vowolamibuger_gixito_rulufodiboka.pdfIn PDF document text
- https://cdn.sqhk.co/nopawuwam/EghidUj/candy_run_cool_math_games.pdfIn PDF document text
- https://babilazumi.weebly.com/uploads/1/3/4/6/134666759/2410004.pdfIn PDF document text
- https://cdn.sqhk.co/mejofiwog/jihhhbU/boost_ewallet_apkpure.pdfIn PDF document text
- https://sokonova.weebly.com/uploads/1/3/4/3/134322069/xofopalupome.pdfIn PDF document text
- https://sezebotari.weebly.com/uploads/1/3/1/6/131636698/809494.pdfIn PDF document text
- https://xadajepiba.weebly.com/uploads/1/3/4/5/134589644/musazusinedekux.pdfIn PDF document text
- https://ribifafugulif.weebly.com/uploads/1/3/4/6/134650062/7245546.pdfIn PDF document text
- https://cdn.sqhk.co/sisadenev/7mFgcjb/27230832389.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000db06.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB06	5284 bytes
SHA-256: `f9f419c966a34891500d5897a80b811bb7ee0ca0ca069bb601d6190235c848a9`
`font_01_sfnt_off0000ed13.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED13	14148 bytes
SHA-256: `6e0a3184e3a93dfb071ef54486206371b0d577dfa21a0978dc5b4ba48ed295ea`
`font_02_sfnt_off0001171e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1171E	16060 bytes
SHA-256: `eb67323a3edc51f073cf7ae7c668a4400309481d93a41d1ca3bfc03d889966df`

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