PDF malware analysis — malicious · 641c1192a2602149

MALICIOUS

PDF

76.0 KB Created: 2021-03-20 17:29:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02

MD5: fb4637cdf2112f6b6e424ef62dcaeebb SHA-1: 5aea8ba051aee88d0792105e0d3c3730fa54f87e SHA-256: 641c1192a26021499768c38918b8abf39e191f9274b506495465346cb7b47c9d

194 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to other PDF files hosted on disposable domains, a common tactic for phishing or distributing further malware. The presence of multiple external links and the use of disposable hosting strongly suggest a malicious purpose.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

Heuristics 7

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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://nipisod.ru/strik?utm_term=the+secret+garden+book+buy+online PDF link annotation
- https://cdn.sqhk.co/fabetojowuje/WZaUgfF/xelezasukonokit.pdfIn PDF document text
- https://cdn.sqhk.co/nipigagavadu/fjihahh/99912002599.pdfIn PDF document text
- https://cdn.sqhk.co/tororukiwuri/jb8OEy7/reaction_trainer_for_pubg_apk_download.pdfIn PDF document text
- http://jipuvojenibomig.22web.org/cao_particuliere_beveiliging_2018.pdfIn PDF document text
- https://cdn.sqhk.co/gukokefa/FjcMggG/61291501258.pdfIn PDF document text
- https://cdn.sqhk.co/minofavazu/jhhehfz/fanozajatutufofesi.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4367667/normal_5fd2e5c89d250.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4445743/normal_600f81f917d63.pdfIn PDF document text
- https://cdn.sqhk.co/kewebogi/jsnVjsV/javixuwuranizame.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4489843/normal_603165c1505d2.pdfIn PDF document text
- https://cdn.sqhk.co/zenetofuma/dljin1W/simozafe.pdfIn PDF document text
- https://butevexonukuzi.weebly.com/uploads/1/3/2/6/132681970/folibixasetidoti.pdfIn PDF document text
- https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/4aa1e2e1af7.pdfIn PDF document text
- https://jafiwivejo.weebly.com/uploads/1/3/5/3/135305612/613976.pdfIn PDF document text
- https://bapumora.weebly.com/uploads/1/3/2/7/132740837/tokubaranu_sipojipu_nabewi_telenavijedug.pdfIn PDF document text
- http://vukesis.iblogger.org/fefajo.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://tebevem.rf.gd/stud_bolt_weight.pdfIn PDF document text
- http://gonidiwofove.epizy.com/janubikulirerebimo.pdfIn PDF document text
- http://boraxatisota.rf.gd/labarakefaxubavedekedoji.pdfIn PDF document text
- http://najorenowodume.epizy.com/7668267854.pdfIn PDF document text
- http://vunodakurawofo.rf.gd/29161522092.pdfIn PDF document text
- http://kajuwipaf.epizy.com/tuzepewebezamig.pdfIn 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_off0000e9a4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9A4	5456 bytes
SHA-256: `1d1b1bc7e12762767446ecec2b1dd45e6bbe46190accce9f343db1fa602ef378`
`font_01_sfnt_off0000fc2f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC2F	10832 bytes
SHA-256: `5ba7ea96be630f00e22fe990ae065cb97abba19afd52adcddc085da7eceee205`

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