PDF malware analysis — malicious · e3b897689cead23b

MALICIOUS

PDF

79.1 KB Created: 2021-02-25 00:26:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16

MD5: 4d0ab6e40a44479198a68f20cc5779b0 SHA-1: a1edcd5d525892f92253e84dc54d91561359ef88 SHA-256: e3b897689cead23bcf7f6b7531a181ea0df580e9497791fe460447b0aa826047

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, indicating it functions as a link farm. Several heuristics, including PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM, confirm this behavior. The ClamAV detection and ML classifier also flag this PDF as malicious, likely due to its role in directing users to potentially harmful websites for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/strik?utm_term=a+job+cost+sheet+contains+%2528check+all+that+apply%2529 PDF link annotation
- http://lezeninimi.medianewsonline.com/dell_1320c_black_ink_cartridge.pdfIn PDF document text
- http://fijixedi.22web.org/xilivibivebenijorosinerex.pdfIn PDF document text
- https://nojesinas.weebly.com/uploads/1/3/0/9/130969722/fumagitetok-badov-dogazogiwapama-vabubaxisovalad.pdfIn PDF document text
- http://komaxinatobofe.medianewsonline.com/no_game_no_life_manga.pdfIn PDF document text
- https://zanazajerepa.weebly.com/uploads/1/3/4/0/134012527/tiwoj-tomewewabaj.pdfIn PDF document text
- https://zuvofuguwapu.weebly.com/uploads/1/3/4/0/134042474/jifuvodanem.pdfIn PDF document text
- https://fajimidisuwa.weebly.com/uploads/1/3/1/6/131606183/tigatosi-koxokil-jugipedupafu-xavumuwesudesi.pdfIn PDF document text
- http://madoxorijegobe.sportsontheweb.net/panurolin.pdfIn PDF document text
- http://kinemulawaw.sportsontheweb.net/86990324722.pdfIn PDF document text
- https://gasibexagitusin.weebly.com/uploads/1/3/1/4/131408117/f7d093eac7.pdfIn PDF document text
- https://cdn.sqhk.co/laxefotogulo/hajafev/97317631125.pdfIn PDF document text
- https://biwizodem.weebly.com/uploads/1/3/4/6/134650183/dc22a.pdfIn PDF document text
- http://vezokikawelin.iblogger.org/experiencing_god_leader_guide_free.pdfIn PDF document text
- https://cdn.sqhk.co/futevanu/wVGgija/98973846843.pdfIn PDF document text
- https://senorori.weebly.com/uploads/1/3/4/6/134641151/bc6781979f.pdfIn PDF document text
- https://betataniboluwi.weebly.com/uploads/1/3/0/9/130969090/vavamotirifudo.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- https://s3.amazonaws.com/tokudapele/solitaire_free_linux.pdfIn PDF document text
- http://menenig.rf.gd/best_workout_for_over_40_female.pdfIn PDF document text
- https://s3.amazonaws.com/sikuva/bpsc_2017_question_paper.pdfIn PDF document text
- https://s3.amazonaws.com/regovadeje/xenepovemariv.pdfIn PDF document text
- http://zigexejumex.epizy.com/rizir.pdfIn PDF document text
- https://s3.amazonaws.com/wizakokowe/21096442654.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000eb5b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB5B	5240 bytes
SHA-256: `f916c0c83b281aa9d60300e57b7530b47140c7564d50ec8598275172fd2c98ba`
`font_01_sfnt_off0000fd2f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD2F	10276 bytes
SHA-256: `ea99006a536bbfc81636378ea70c31c9fe5322be964eb43d89ca158242fa2e5a`
`font_02_sfnt_off00012057.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12057	4324 bytes
SHA-256: `1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361`

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